diff --git a/src/strands_evals/cli/commands/validate.py b/src/strands_evals/cli/commands/validate.py
index 4488506d..44fdd726 100644
--- a/src/strands_evals/cli/commands/validate.py
+++ b/src/strands_evals/cli/commands/validate.py
@@ -16,7 +16,7 @@ def _run(args: argparse.Namespace) -> int:
     experiment: Experiment = Experiment.from_file(args.experiment_file, custom_evaluators=custom_evaluators)
 
     case_count = len(experiment.cases)
-    evaluator_names = [evaluator.get_type_name() for evaluator in experiment.evaluators]
+    evaluator_names = [evaluator.get_name() for evaluator in experiment.evaluators]
 
     fmt = resolve_format(args)
     if fmt == "json":
diff --git a/src/strands_evals/evaluators/chaos/failure_communication_evaluator.py b/src/strands_evals/evaluators/chaos/failure_communication_evaluator.py
index 021c0e78..f4fce300 100644
--- a/src/strands_evals/evaluators/chaos/failure_communication_evaluator.py
+++ b/src/strands_evals/evaluators/chaos/failure_communication_evaluator.py
@@ -46,8 +46,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.version = version
         default_prompt = get_template(version).SYSTEM_PROMPT
         self.system_prompt = system_prompt if system_prompt is not None else default_prompt
diff --git a/src/strands_evals/evaluators/chaos/partial_completion_evaluator.py b/src/strands_evals/evaluators/chaos/partial_completion_evaluator.py
index 1254fd62..ac6ba9ed 100644
--- a/src/strands_evals/evaluators/chaos/partial_completion_evaluator.py
+++ b/src/strands_evals/evaluators/chaos/partial_completion_evaluator.py
@@ -27,8 +27,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.version = version
         default_prompt = get_template(version).SYSTEM_PROMPT
         self.system_prompt = system_prompt if system_prompt is not None else default_prompt
diff --git a/src/strands_evals/evaluators/chaos/recovery_strategy_evaluator.py b/src/strands_evals/evaluators/chaos/recovery_strategy_evaluator.py
index 3e044452..21ccf888 100644
--- a/src/strands_evals/evaluators/chaos/recovery_strategy_evaluator.py
+++ b/src/strands_evals/evaluators/chaos/recovery_strategy_evaluator.py
@@ -46,8 +46,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.version = version
         default_prompt = get_template(version).SYSTEM_PROMPT
         self.system_prompt = system_prompt if system_prompt is not None else default_prompt
diff --git a/src/strands_evals/evaluators/coherence_evaluator.py b/src/strands_evals/evaluators/coherence_evaluator.py
index c85d14fe..dc2e085c 100644
--- a/src/strands_evals/evaluators/coherence_evaluator.py
+++ b/src/strands_evals/evaluators/coherence_evaluator.py
@@ -59,8 +59,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt or get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/conciseness_evaluator.py b/src/strands_evals/evaluators/conciseness_evaluator.py
index 2005accb..8bea4b9a 100644
--- a/src/strands_evals/evaluators/conciseness_evaluator.py
+++ b/src/strands_evals/evaluators/conciseness_evaluator.py
@@ -43,8 +43,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt or get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/correctness_evaluator.py b/src/strands_evals/evaluators/correctness_evaluator.py
index b0c8f4f9..c7bbcacd 100644
--- a/src/strands_evals/evaluators/correctness_evaluator.py
+++ b/src/strands_evals/evaluators/correctness_evaluator.py
@@ -75,8 +75,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         reference_system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.reference_system_prompt = (
             reference_system_prompt
diff --git a/src/strands_evals/evaluators/deterministic/environment_state.py b/src/strands_evals/evaluators/deterministic/environment_state.py
index 23673906..f70391c1 100644
--- a/src/strands_evals/evaluators/deterministic/environment_state.py
+++ b/src/strands_evals/evaluators/deterministic/environment_state.py
@@ -13,11 +13,18 @@ def _find_state_by_name(states: list[EnvironmentState], name: str) -> Environmen
 
 
 class StateEquals(Evaluator[InputT, OutputT]):
-    """Checks if a named environment state matches an expected value."""
+    """Checks if a named environment state matches an expected value.
+
+    The `name` arg doubles as the state key in `EnvironmentState` and the
+    instance-level evaluator name surfaced through `get_name()`, so two
+    `StateEquals(name="cart")` / `StateEquals(name="balance")` instances
+    are naturally distinguishable in `EvaluationReport.cases`.
+    """
+
+    name: str  # required, not Optional — narrows the base class annotation
 
     def __init__(self, name: str, value: Any | None = None):
-        super().__init__()
-        self.name = name
+        super().__init__(name=name)
         self.value = value
 
     def evaluate(self, evaluation_case: EvaluationData[InputT, OutputT]) -> list[EvaluationOutput]:
diff --git a/src/strands_evals/evaluators/deterministic/output.py b/src/strands_evals/evaluators/deterministic/output.py
index b97445fa..174628a9 100644
--- a/src/strands_evals/evaluators/deterministic/output.py
+++ b/src/strands_evals/evaluators/deterministic/output.py
@@ -7,8 +7,8 @@
 class Equals(Evaluator[InputT, OutputT]):
     """Checks if actual_output equals an expected value."""
 
-    def __init__(self, value: Any | None = None):
-        super().__init__()
+    def __init__(self, value: Any | None = None, name: str | None = None):
+        super().__init__(name=name)
         self.value = value
 
     def evaluate(self, evaluation_case: EvaluationData[InputT, OutputT]) -> list[EvaluationOutput]:
@@ -29,8 +29,8 @@ async def evaluate_async(self, evaluation_case: EvaluationData[InputT, OutputT])
 class Contains(Evaluator[InputT, OutputT]):
     """Checks if actual_output contains a substring."""
 
-    def __init__(self, value: str, case_sensitive: bool = True):
-        super().__init__()
+    def __init__(self, value: str, case_sensitive: bool = True, name: str | None = None):
+        super().__init__(name=name)
         self.value = value
         self.case_sensitive = case_sensitive
 
@@ -56,8 +56,8 @@ async def evaluate_async(self, evaluation_case: EvaluationData[InputT, OutputT])
 class StartsWith(Evaluator[InputT, OutputT]):
     """Checks if actual_output starts with a prefix."""
 
-    def __init__(self, value: str, case_sensitive: bool = True):
-        super().__init__()
+    def __init__(self, value: str, case_sensitive: bool = True, name: str | None = None):
+        super().__init__(name=name)
         self.value = value
         self.case_sensitive = case_sensitive
 
diff --git a/src/strands_evals/evaluators/deterministic/trajectory.py b/src/strands_evals/evaluators/deterministic/trajectory.py
index 0c129bf6..0995ee29 100644
--- a/src/strands_evals/evaluators/deterministic/trajectory.py
+++ b/src/strands_evals/evaluators/deterministic/trajectory.py
@@ -6,8 +6,8 @@
 class ToolCalled(Evaluator[InputT, OutputT]):
     """Checks if a specific tool was called in the trajectory."""
 
-    def __init__(self, tool_name: str):
-        super().__init__()
+    def __init__(self, tool_name: str, name: str | None = None):
+        super().__init__(name=name)
         self.tool_name = tool_name
 
     def evaluate(self, evaluation_case: EvaluationData[InputT, OutputT]) -> list[EvaluationOutput]:
diff --git a/src/strands_evals/evaluators/evaluator.py b/src/strands_evals/evaluators/evaluator.py
index bb70af73..75b50924 100644
--- a/src/strands_evals/evaluators/evaluator.py
+++ b/src/strands_evals/evaluators/evaluator.py
@@ -36,14 +36,22 @@ class Evaluator(Generic[InputT, OutputT]):
     evaluation_level: EvaluationLevel | None = None
     _trace_extractor: TraceExtractor | None = None
 
-    def __init__(self, trace_extractor: TraceExtractor | None = None):
+    def __init__(self, trace_extractor: TraceExtractor | None = None, name: str | None = None):
         """Initialize evaluator with optional custom trace extractor.
 
         Args:
             trace_extractor: Custom trace extractor. If None and evaluation_level is set,
                            a default TraceExtractor will be created.
+            name: Instance-level identifier used as the evaluator tag in
+                `EvaluationReport.cases[i]["evaluator"]` and as
+                `gen_ai.evaluation.name` on emitted spans/logs. When two
+                instances of the same class run in one experiment (e.g.,
+                `Contains(value="x")` and `Contains(value="y")`), distinct
+                names keep their results from colliding. Defaults to the
+                class name when unset.
         """
         self.aggregator = self._default_aggregator
+        self.name = name
         if trace_extractor:
             self._trace_extractor = trace_extractor
         elif self.evaluation_level:
@@ -264,6 +272,18 @@ def get_type_name(cls) -> str:
         """
         return cls.__name__
 
+    def get_name(self) -> str:
+        """Get the instance-level evaluator name, falling back to the class name.
+
+        Used for the per-row `evaluator` tag in `EvaluationReport` and the
+        `gen_ai.evaluation.name` OTel attribute. `get_type_name()` is still
+        used for class-keyed lookups such as `from_dict` registry resolution.
+
+        Returns:
+            str: The instance name if set, otherwise the class name.
+        """
+        return self.name or self.get_type_name()
+
     def to_dict(self) -> dict:
         """
         Convert the evaluator into a dictionary.
diff --git a/src/strands_evals/evaluators/faithfulness_evaluator.py b/src/strands_evals/evaluators/faithfulness_evaluator.py
index 36762b46..5c5f05e9 100644
--- a/src/strands_evals/evaluators/faithfulness_evaluator.py
+++ b/src/strands_evals/evaluators/faithfulness_evaluator.py
@@ -46,8 +46,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/goal_success_rate_evaluator.py b/src/strands_evals/evaluators/goal_success_rate_evaluator.py
index edcd661e..8c33061d 100644
--- a/src/strands_evals/evaluators/goal_success_rate_evaluator.py
+++ b/src/strands_evals/evaluators/goal_success_rate_evaluator.py
@@ -72,8 +72,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         assertion_system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.assertion_system_prompt = (
             assertion_system_prompt
diff --git a/src/strands_evals/evaluators/harmfulness_evaluator.py b/src/strands_evals/evaluators/harmfulness_evaluator.py
index 08a777de..edd0b463 100644
--- a/src/strands_evals/evaluators/harmfulness_evaluator.py
+++ b/src/strands_evals/evaluators/harmfulness_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/helpfulness_evaluator.py b/src/strands_evals/evaluators/helpfulness_evaluator.py
index 8a29de0f..f5b99f53 100644
--- a/src/strands_evals/evaluators/helpfulness_evaluator.py
+++ b/src/strands_evals/evaluators/helpfulness_evaluator.py
@@ -51,8 +51,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/instruction_following_evaluator.py b/src/strands_evals/evaluators/instruction_following_evaluator.py
index c395a102..bc1f2acd 100644
--- a/src/strands_evals/evaluators/instruction_following_evaluator.py
+++ b/src/strands_evals/evaluators/instruction_following_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/interactions_evaluator.py b/src/strands_evals/evaluators/interactions_evaluator.py
index 09781ce1..ea7be7f6 100644
--- a/src/strands_evals/evaluators/interactions_evaluator.py
+++ b/src/strands_evals/evaluators/interactions_evaluator.py
@@ -32,8 +32,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str = SYSTEM_PROMPT,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.rubric = rubric
         self.interaction_description = interaction_description
         self.model = model
diff --git a/src/strands_evals/evaluators/multimodal_correctness_evaluator.py b/src/strands_evals/evaluators/multimodal_correctness_evaluator.py
index 04549f8a..557b8a17 100644
--- a/src/strands_evals/evaluators/multimodal_correctness_evaluator.py
+++ b/src/strands_evals/evaluators/multimodal_correctness_evaluator.py
@@ -24,6 +24,7 @@ def __init__(
         system_prompt: str | None = None,
         reference_suffix: str | None = None,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
         super().__init__(
             rubric=rubric if rubric is not None else CORRECTNESS_RUBRIC_V0,
@@ -32,4 +33,5 @@ def __init__(
             system_prompt=system_prompt,
             reference_suffix=reference_suffix,
             uses_environment_state=uses_environment_state,
+            name=name,
         )
diff --git a/src/strands_evals/evaluators/multimodal_faithfulness_evaluator.py b/src/strands_evals/evaluators/multimodal_faithfulness_evaluator.py
index 9b09ccc1..319950b2 100644
--- a/src/strands_evals/evaluators/multimodal_faithfulness_evaluator.py
+++ b/src/strands_evals/evaluators/multimodal_faithfulness_evaluator.py
@@ -23,6 +23,7 @@ def __init__(
         system_prompt: str | None = None,
         reference_suffix: str | None = None,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
         super().__init__(
             rubric=rubric if rubric is not None else FAITHFULNESS_RUBRIC_V0,
@@ -31,4 +32,5 @@ def __init__(
             system_prompt=system_prompt,
             reference_suffix=reference_suffix,
             uses_environment_state=uses_environment_state,
+            name=name,
         )
diff --git a/src/strands_evals/evaluators/multimodal_instruction_following_evaluator.py b/src/strands_evals/evaluators/multimodal_instruction_following_evaluator.py
index dcea0b88..57782ba4 100644
--- a/src/strands_evals/evaluators/multimodal_instruction_following_evaluator.py
+++ b/src/strands_evals/evaluators/multimodal_instruction_following_evaluator.py
@@ -23,6 +23,7 @@ def __init__(
         system_prompt: str | None = None,
         reference_suffix: str | None = None,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
         super().__init__(
             rubric=rubric if rubric is not None else INSTRUCTION_FOLLOWING_RUBRIC_V0,
@@ -31,4 +32,5 @@ def __init__(
             system_prompt=system_prompt,
             reference_suffix=reference_suffix,
             uses_environment_state=uses_environment_state,
+            name=name,
         )
diff --git a/src/strands_evals/evaluators/multimodal_output_evaluator.py b/src/strands_evals/evaluators/multimodal_output_evaluator.py
index 232e9553..827bbd5f 100644
--- a/src/strands_evals/evaluators/multimodal_output_evaluator.py
+++ b/src/strands_evals/evaluators/multimodal_output_evaluator.py
@@ -45,6 +45,7 @@ def __init__(
         system_prompt: str | None = None,
         reference_suffix: str | None = None,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
         super().__init__(
             rubric=rubric,
@@ -52,6 +53,7 @@ def __init__(
             system_prompt=system_prompt if system_prompt is not None else MLLM_JUDGE_SYSTEM_PROMPT,
             include_inputs=include_inputs,
             uses_environment_state=uses_environment_state,
+            name=name,
         )
         self.reference_suffix = reference_suffix if reference_suffix is not None else self.DEFAULT_REFERENCE_SUFFIX
 
diff --git a/src/strands_evals/evaluators/multimodal_overall_quality_evaluator.py b/src/strands_evals/evaluators/multimodal_overall_quality_evaluator.py
index acdd0fec..e246f020 100644
--- a/src/strands_evals/evaluators/multimodal_overall_quality_evaluator.py
+++ b/src/strands_evals/evaluators/multimodal_overall_quality_evaluator.py
@@ -34,6 +34,7 @@ def __init__(
         system_prompt: str | None = None,
         reference_suffix: str | None = None,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
         super().__init__(
             rubric=rubric if rubric is not None else OVERALL_QUALITY_RUBRIC_V0,
@@ -42,4 +43,5 @@ def __init__(
             system_prompt=system_prompt,
             reference_suffix=reference_suffix if reference_suffix is not None else _OVERALL_QUALITY_REFERENCE_SUFFIX,
             uses_environment_state=uses_environment_state,
+            name=name,
         )
diff --git a/src/strands_evals/evaluators/output_evaluator.py b/src/strands_evals/evaluators/output_evaluator.py
index 24148adb..f732e9d3 100644
--- a/src/strands_evals/evaluators/output_evaluator.py
+++ b/src/strands_evals/evaluators/output_evaluator.py
@@ -29,8 +29,9 @@ def __init__(
         system_prompt: str = SYSTEM_PROMPT,
         include_inputs: bool = True,
         uses_environment_state: bool = False,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.rubric = rubric
         self.model = model
         self.include_inputs = include_inputs
diff --git a/src/strands_evals/evaluators/refusal_evaluator.py b/src/strands_evals/evaluators/refusal_evaluator.py
index 401f0ea1..6e00285d 100644
--- a/src/strands_evals/evaluators/refusal_evaluator.py
+++ b/src/strands_evals/evaluators/refusal_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/response_relevance_evaluator.py b/src/strands_evals/evaluators/response_relevance_evaluator.py
index 27288ea4..c9277223 100644
--- a/src/strands_evals/evaluators/response_relevance_evaluator.py
+++ b/src/strands_evals/evaluators/response_relevance_evaluator.py
@@ -48,8 +48,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt or get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/stereotyping_evaluator.py b/src/strands_evals/evaluators/stereotyping_evaluator.py
index a63afc17..99f46295 100644
--- a/src/strands_evals/evaluators/stereotyping_evaluator.py
+++ b/src/strands_evals/evaluators/stereotyping_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/tool_parameter_accuracy_evaluator.py b/src/strands_evals/evaluators/tool_parameter_accuracy_evaluator.py
index 1be12e08..40ee7f1e 100644
--- a/src/strands_evals/evaluators/tool_parameter_accuracy_evaluator.py
+++ b/src/strands_evals/evaluators/tool_parameter_accuracy_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/tool_selection_accuracy_evaluator.py b/src/strands_evals/evaluators/tool_selection_accuracy_evaluator.py
index 76e29e6c..ced8756c 100644
--- a/src/strands_evals/evaluators/tool_selection_accuracy_evaluator.py
+++ b/src/strands_evals/evaluators/tool_selection_accuracy_evaluator.py
@@ -40,8 +40,9 @@ def __init__(
         version: str = "v0",
         model: Model | str | None = None,
         system_prompt: str | None = None,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.system_prompt = system_prompt if system_prompt is not None else get_template(version).SYSTEM_PROMPT
         self.version = version
         self.model = model
diff --git a/src/strands_evals/evaluators/trajectory_evaluator.py b/src/strands_evals/evaluators/trajectory_evaluator.py
index acc5fa36..298ddeed 100644
--- a/src/strands_evals/evaluators/trajectory_evaluator.py
+++ b/src/strands_evals/evaluators/trajectory_evaluator.py
@@ -32,8 +32,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str = SYSTEM_PROMPT,
         include_inputs: bool = True,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         self.rubric = rubric
         self.trajectory_description = trajectory_description
         self.model = model
diff --git a/src/strands_evals/experiment.py b/src/strands_evals/experiment.py
index 75afc494..de42b984 100644
--- a/src/strands_evals/experiment.py
+++ b/src/strands_evals/experiment.py
@@ -174,6 +174,24 @@ def evaluators(self, new_evaluators: list[Evaluator[InputT, OutputT]]):
         """
         self._evaluators = new_evaluators
 
+    def _validate_evaluator_names(self) -> None:
+        """Validate that all evaluators expose unique names.
+
+        Two instances of the same Evaluator subclass collide on the default
+        class-name fallback; pass `name="..."` to disambiguate.
+
+        Raises:
+            ValueError: If two evaluators resolve to the same `get_name()`.
+        """
+        names = [evaluator.get_name() for evaluator in self._evaluators]
+        duplicates = sorted({n for n in names if names.count(n) > 1})
+        if duplicates:
+            raise ValueError(
+                f"Evaluator names must be unique within an experiment. "
+                f"Duplicates: {duplicates}. Pass `name=...` when constructing "
+                f"multiple instances of the same Evaluator subclass."
+            )
+
     def _validate_case_names(self) -> None:
         """Validate that all cases have unique, non-None names.
 
@@ -334,9 +352,9 @@ async def _evaluate_with_retry(evaluator=evaluator, evaluation_context=evaluatio
 
         try:
             with self._tracer.start_as_current_span(
-                f"evaluator {evaluator.get_type_name()}",
+                f"evaluator {evaluator.get_name()}",
                 attributes={
-                    "gen_ai.evaluation.name": evaluator.get_type_name(),
+                    "gen_ai.evaluation.name": evaluator.get_name(),
                     "gen_ai.evaluation.case.name": case_name,
                 },
             ) as eval_span:
@@ -363,7 +381,7 @@ async def _evaluate_with_retry(evaluator=evaluator, evaluation_context=evaluatio
 
                 # CloudWatch logging for this evaluator
                 try:
-                    evaluator_full_name = f"Custom.{evaluator.get_type_name()}"
+                    evaluator_full_name = f"Custom.{evaluator.get_name()}"
                     region = os.environ.get("AWS_REGION", "us-east-1")
                     _config_arn = f"arn:aws:strands:{region}::strands-evaluation-empty-config/{self._config_id}"
                     _evaluator_arn = f"arn:aws:strands-evals:::evaluator/{evaluator_full_name}"
@@ -398,7 +416,8 @@ async def _evaluate_with_retry(evaluator=evaluator, evaluation_context=evaluatio
                     logger.debug(f"Skipping CloudWatch logging: {str(e)}")
 
                 return {
-                    "evaluator_name": evaluator.get_type_name(),
+                    "evaluator_name": evaluator.get_name(),
+                    "evaluator_type": evaluator.get_type_name(),
                     "test_pass": aggregate_pass,
                     "score": aggregate_score,
                     "reason": aggregate_reason or "",
@@ -410,15 +429,16 @@ async def _evaluate_with_retry(evaluator=evaluator, evaluation_context=evaluatio
             original_exception = e.last_attempt.exception()
             if original_exception is None:
                 original_exception = Exception(
-                    f"Evaluator {evaluator.get_type_name()} failed after {_MAX_RETRY_ATTEMPTS} retries"
+                    f"Evaluator {evaluator.get_name()} failed after {_MAX_RETRY_ATTEMPTS} retries"
                 )
             logger.error(
                 f"Max retry attempts ({_MAX_RETRY_ATTEMPTS}) exceeded for evaluator "
-                f"{evaluator.get_type_name()} on case {case_name}. "
+                f"{evaluator.get_name()} on case {case_name}. "
                 f"Last error: {str(original_exception)}"
             )
             return {
-                "evaluator_name": evaluator.get_type_name(),
+                "evaluator_name": evaluator.get_name(),
+                "evaluator_type": evaluator.get_type_name(),
                 "test_pass": False,
                 "score": 0,
                 "reason": f"Evaluator error: {str(original_exception)}",
@@ -427,7 +447,8 @@ async def _evaluate_with_retry(evaluator=evaluator, evaluation_context=evaluatio
         except Exception as e:
             # Catch non-throttling errors and record as failure (error isolation)
             return {
-                "evaluator_name": evaluator.get_type_name(),
+                "evaluator_name": evaluator.get_name(),
+                "evaluator_type": evaluator.get_type_name(),
                 "test_pass": False,
                 "score": 0,
                 "reason": f"Evaluator error: {str(e)}",
@@ -542,7 +563,8 @@ async def _worker(
                         for evaluator in self._evaluators:
                             evaluator_results.append(
                                 {
-                                    "evaluator_name": evaluator.get_type_name(),
+                                    "evaluator_name": evaluator.get_name(),
+                                    "evaluator_type": evaluator.get_type_name(),
                                     "test_pass": False,
                                     "score": 0,
                                     "reason": f"An error occurred: {str(e)}",
@@ -604,6 +626,8 @@ async def run_evaluations_async(
             A single EvaluationReport flattened across every evaluator. Each row in `cases` carries
             an `evaluator` key naming which evaluator produced it.
         """
+        self._validate_evaluator_names()
+
         if evaluation_data_store is not None:
             self._validate_case_names()
 
@@ -624,9 +648,10 @@ async def run_evaluations_async(
             worker.cancel()
         await asyncio.gather(*workers, return_exceptions=True)
 
-        # Organize results by evaluator
+        # Organize results by evaluator (keyed on instance name so two instances
+        # of the same class with distinct `name=` kwargs do not collide).
         evaluator_data: dict[str, dict[str, list]] = {
-            evaluator.get_type_name(): {
+            evaluator.get_name(): {
                 "scores": [],
                 "test_passes": [],
                 "cases": [],
@@ -644,7 +669,9 @@ async def run_evaluations_async(
             recommendation = result.get("recommendation")
             for eval_result in result["evaluator_results"]:
                 eval_name = eval_result["evaluator_name"]
-                evaluator_data[eval_name]["cases"].append({**case_data, "evaluator": eval_name})
+                evaluator_data[eval_name]["cases"].append(
+                    {**case_data, "evaluator": eval_name, "evaluator_type": eval_result["evaluator_type"]}
+                )
                 evaluator_data[eval_name]["scores"].append(eval_result["score"])
                 evaluator_data[eval_name]["test_passes"].append(eval_result["test_pass"])
                 evaluator_data[eval_name]["reasons"].append(eval_result["reason"])
@@ -654,7 +681,7 @@ async def run_evaluations_async(
 
         reports = []
         for evaluator in self._evaluators:
-            eval_name = evaluator.get_type_name()
+            eval_name = evaluator.get_name()
             data = evaluator_data[eval_name]
             scores = data["scores"]
             report = EvaluationReport(
diff --git a/src/strands_evals/experimental/redteam/evaluators/attack_success_evaluator.py b/src/strands_evals/experimental/redteam/evaluators/attack_success_evaluator.py
index d2f2905d..4e6a97b7 100644
--- a/src/strands_evals/experimental/redteam/evaluators/attack_success_evaluator.py
+++ b/src/strands_evals/experimental/redteam/evaluators/attack_success_evaluator.py
@@ -33,8 +33,9 @@ def __init__(
         model: Model | str | None = None,
         system_prompt: str | None = None,
         pass_threshold: float = 0.3,
+        name: str | None = None,
     ):
-        super().__init__()
+        super().__init__(name=name)
         template = get_template(version)
         self.version = version
         self.model = model
diff --git a/tests/strands_evals/evaluators/test_evaluator.py b/tests/strands_evals/evaluators/test_evaluator.py
index 09f9c65d..4fe8c561 100644
--- a/tests/strands_evals/evaluators/test_evaluator.py
+++ b/tests/strands_evals/evaluators/test_evaluator.py
@@ -288,3 +288,18 @@ def test_extract_text_content_user_message_with_tool_result():
 
     result = evaluator._extract_text_content(msg)
     assert result == "Here's the result"
+
+
+def test_get_name_defaults_to_class_name():
+    """Without a name kwarg, get_name() falls back to the class name."""
+    evaluator = SimpleEvaluator()
+    assert evaluator.get_name() == "SimpleEvaluator"
+    assert evaluator.get_name() == evaluator.get_type_name()
+
+
+def test_get_name_uses_explicit_name():
+    """An explicit name kwarg overrides the class-name fallback."""
+    evaluator = SimpleEvaluator(name="my_simple_check")
+    assert evaluator.get_name() == "my_simple_check"
+    # get_type_name() still reports the class for from_dict registry lookups.
+    assert evaluator.get_type_name() == "SimpleEvaluator"
diff --git a/tests/strands_evals/test_experiment.py b/tests/strands_evals/test_experiment.py
index c1867133..b8be325e 100644
--- a/tests/strands_evals/test_experiment.py
+++ b/tests/strands_evals/test_experiment.py
@@ -2052,3 +2052,74 @@ def task_with_session(c):
 
         assert report.diagnoses == [None]
         assert report.recommendations == [None]
+
+
+def test_run_evaluations_two_same_class_evaluators_with_distinct_names():
+    """Two instances of the same class with `name=...` produce distinct rows."""
+    cases = [
+        Case(name="france", input="france", expected_output="paris"),
+        Case(name="japan", input="japan", expected_output="tokyo"),
+    ]
+    experiment = Experiment(
+        cases=cases,
+        evaluators=[
+            Contains(value="paris", name="contains_paris"),
+            Contains(value="tokyo", name="contains_tokyo"),
+        ],
+    )
+
+    def task(case):
+        return {"france": "paris", "japan": "tokyo"}[case.input]
+
+    report = experiment.run_evaluations(task)
+
+    tags = [row["evaluator"] for row in report.cases]
+    assert sorted(tags) == ["contains_paris", "contains_paris", "contains_tokyo", "contains_tokyo"]
+
+    # Both instances share the class name, so consumers can group/aggregate by type
+    # even when instance names diverge.
+    assert {row["evaluator_type"] for row in report.cases} == {"Contains"}
+
+    rows = list(zip(report.cases, report.test_passes, strict=True))
+    paris_by_case = {row["name"]: passed for row, passed in rows if row["evaluator"] == "contains_paris"}
+    tokyo_by_case = {row["name"]: passed for row, passed in rows if row["evaluator"] == "contains_tokyo"}
+    assert paris_by_case == {"france": True, "japan": False}
+    assert tokyo_by_case == {"france": False, "japan": True}
+
+
+def test_run_evaluations_rejects_duplicate_evaluator_names():
+    """Two evaluators with the same effective name raise before running."""
+    experiment = Experiment(
+        cases=[Case(name="c1", input="x")],
+        evaluators=[Contains(value="a"), Contains(value="b")],
+    )
+
+    with pytest.raises(ValueError, match="Evaluator names must be unique"):
+        experiment.run_evaluations(lambda case: case.input)
+
+
+def test_evaluator_name_round_trips_through_to_dict_from_dict():
+    """to_dict emits `name` for explicitly-named evaluators, from_dict restores it."""
+    experiment = Experiment(
+        cases=[Case(name="c1", input="x")],
+        evaluators=[Contains(value="hello", name="contains_hello")],
+    )
+
+    payload = experiment.to_dict()
+    assert payload["evaluators"][0]["evaluator_type"] == "Contains"
+    assert payload["evaluators"][0]["name"] == "contains_hello"
+
+    restored = Experiment.from_dict(payload)
+    assert restored.evaluators[0].get_name() == "contains_hello"
+    assert restored.evaluators[0].get_type_name() == "Contains"
+
+
+def test_evaluator_name_default_omitted_from_to_dict():
+    """When no name is set, to_dict omits the field (matches existing default-stripping)."""
+    experiment = Experiment(
+        cases=[Case(name="c1", input="x")],
+        evaluators=[Contains(value="hello")],
+    )
+
+    payload = experiment.to_dict()
+    assert "name" not in payload["evaluators"][0]