diff --git a/app/controllers/concerns/idv/verify_info_concern.rb b/app/controllers/concerns/idv/verify_info_concern.rb
index f5e0afbdc04..c942a596823 100644
--- a/app/controllers/concerns/idv/verify_info_concern.rb
+++ b/app/controllers/concerns/idv/verify_info_concern.rb
@@ -208,6 +208,7 @@ def async_state_done(current_async_state)
         extra: {
           address_edited: !!idv_session.address_edited,
           address_line2_present: !pii[:address2].blank?,
+          last_name_spaced: pii[:last_name].split(' ').many?,
           previous_ssn_edit_distance: previous_ssn_edit_distance,
           pii_like_keypaths: [
             [:errors, :ssn],
diff --git a/app/services/analytics_events.rb b/app/services/analytics_events.rb
index 6aa1ecea9b1..990337b3d69 100644
--- a/app/services/analytics_events.rb
+++ b/app/services/analytics_events.rb
@@ -2151,6 +2151,7 @@ def idv_doc_auth_verify_polling_wait_visited(**extra)
   # @param analytics_id [String] "Doc Auth" for remote unsupervised, "In Person Proofing" for IPP
   # @param errors [Hash] Details about vendor-specific errors encountered during the stages of the identity resolution process
   # @param flow_path [String] "hybrid" for hybrid handoff, "standard" otherwise
+  # @param last_name_spaced [Boolean] Whether the user's last name includes an empty space
   # @param lexisnexis_instant_verify_workflow_ab_test_bucket [String] A/B test bucket for Lexis Nexis InstantVerify workflow testing
   # @param opted_in_to_in_person_proofing [Boolean] Whether this user explicitly opted into in-person proofing
   # @param proofing_results [Hash]
@@ -2217,6 +2218,7 @@ def idv_doc_auth_verify_proofing_results(
     analytics_id: nil,
     errors: nil,
     flow_path: nil,
+    last_name_spaced: nil,
     lexisnexis_instant_verify_workflow_ab_test_bucket: nil,
     opted_in_to_in_person_proofing: nil,
     proofing_results: nil,
@@ -2237,6 +2239,7 @@ def idv_doc_auth_verify_proofing_results(
       errors:,
       flow_path:,
       lexisnexis_instant_verify_workflow_ab_test_bucket:,
+      last_name_spaced:,
       opted_in_to_in_person_proofing:,
       proofing_results:,
       skip_hybrid_handoff:,
diff --git a/app/services/proofing/aamva/request/verification_request.rb b/app/services/proofing/aamva/request/verification_request.rb
index 30dc750dc6c..7cf9c623267 100644
--- a/app/services/proofing/aamva/request/verification_request.rb
+++ b/app/services/proofing/aamva/request/verification_request.rb
@@ -274,10 +274,10 @@ def transaction_locator_id
 
         def user_provided_data_map
           {
-            state_id_number: state_id_number,
+            state_id_number:,
             state_id_jurisdiction: message_destination_id,
             first_name: applicant.first_name,
-            last_name: applicant.last_name,
+            last_name:,
             dob: applicant.dob,
             address1: applicant.address1,
             city: applicant.city,
@@ -295,6 +295,15 @@ def state_id_number
           end
         end
 
+        def last_name
+          if IdentityConfig.store.idv_aamva_split_last_name_states
+              .include? applicant.state_id_data.state_id_jurisdiction
+            applicant.last_name.split(' ').first
+          else
+            applicant.last_name
+          end
+        end
+
         def timeout
           (config.verification_request_timeout || 5).to_f
         end
diff --git a/config/application.yml.default b/config/application.yml.default
index e5c7dc8b244..df6928ce03f 100644
--- a/config/application.yml.default
+++ b/config/application.yml.default
@@ -164,6 +164,7 @@ hmac_fingerprinter_key:
 hmac_fingerprinter_key_queue: '[]'
 identity_pki_disabled: false
 identity_pki_local_dev: false
+idv_aamva_split_last_name_states: '[]'
 idv_account_verified_email_campaign_id: '20241028'
 idv_acuant_sdk_upgrade_a_b_testing_enabled: false
 idv_acuant_sdk_upgrade_a_b_testing_percent: 50
diff --git a/lib/identity_config.rb b/lib/identity_config.rb
index 25d7549af81..e148ccf800b 100644
--- a/lib/identity_config.rb
+++ b/lib/identity_config.rb
@@ -209,6 +209,7 @@ def self.store
     config.add(:idv_socure_shadow_mode_enabled, type: :boolean)
     config.add(:idv_socure_shadow_mode_enabled_for_docv_users, type: :boolean)
     config.add(:idv_sp_required, type: :boolean)
+    config.add(:idv_aamva_split_last_name_states, type: :json)
     config.add(:in_person_completion_survey_delivery_enabled, type: :boolean)
     config.add(:in_person_completion_survey_url, type: :string)
     config.add(:in_person_doc_auth_button_enabled, type: :boolean)
diff --git a/spec/features/idv/analytics_spec.rb b/spec/features/idv/analytics_spec.rb
index 65be952d77a..bb556f10bf7 100644
--- a/spec/features/idv/analytics_spec.rb
+++ b/spec/features/idv/analytics_spec.rb
@@ -266,7 +266,7 @@
         end
       ),
       'IdV: doc auth verify proofing results' => {
-        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, analytics_id: 'Doc Auth', step: 'verify',
+        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, last_name_spaced: false, analytics_id: 'Doc Auth', step: 'verify',
         proofing_results: doc_auth_verify_proofing_results,
         proofing_components: base_proofing_components
       },
@@ -391,7 +391,7 @@
         end
       ),
       'IdV: doc auth verify proofing results' => {
-        success: true, flow_path: 'hybrid', address_edited: false, address_line2_present: false, analytics_id: 'Doc Auth', step: 'verify',
+        success: true, flow_path: 'hybrid', address_edited: false, address_line2_present: false, last_name_spaced: false, analytics_id: 'Doc Auth', step: 'verify',
         proofing_results: doc_auth_verify_proofing_results,
         proofing_components: base_proofing_components
       },
@@ -514,7 +514,7 @@
         end
       ),
       'IdV: doc auth verify proofing results' => {
-        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, analytics_id: 'Doc Auth', step: 'verify',
+        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, last_name_spaced: false, analytics_id: 'Doc Auth', step: 'verify',
         proofing_results: doc_auth_verify_proofing_results,
         proofing_components: base_proofing_components
       },
@@ -632,7 +632,7 @@
         end
       ),
       'IdV: doc auth verify proofing results' => {
-        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, analytics_id: 'In Person Proofing', step: 'verify',
+        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, last_name_spaced: false, analytics_id: 'In Person Proofing', step: 'verify',
         proofing_results: in_person_path_proofing_results,
         proofing_components: { document_check: 'usps', resolution_check: 'ResolutionMock', residential_resolution_check: 'ResolutionMock', source_check: 'StateIdMock', threatmetrix: threatmetrix, threatmetrix_review_status: 'pass' }
       },
@@ -761,7 +761,7 @@
         end
       ),
       'IdV: doc auth verify proofing results' => {
-        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, analytics_id: 'Doc Auth', step: 'verify',
+        success: true, flow_path: 'standard', address_edited: false, address_line2_present: false, last_name_spaced: false, analytics_id: 'Doc Auth', step: 'verify',
         proofing_results: doc_auth_verify_proofing_results,
         proofing_components: base_proofing_components
       },
diff --git a/spec/services/proofing/aamva/request/verification_request_spec.rb b/spec/services/proofing/aamva/request/verification_request_spec.rb
index 3a24ee8a7cd..33ca99db23a 100644
--- a/spec/services/proofing/aamva/request/verification_request_spec.rb
+++ b/spec/services/proofing/aamva/request/verification_request_spec.rb
@@ -6,13 +6,14 @@
   let(:config) { AamvaFixtures.example_config }
   let(:state_id_jurisdiction) { 'CA' }
   let(:state_id_number) { '123456789' }
+  let(:last_name) { 'McTesterson' }
 
   let(:applicant_data) do
     {
       uuid: '1234-abcd-efgh',
       first_name: 'Testy',
       middle_name: nil,
-      last_name: 'McTesterson',
+      last_name:,
       name_suffix: nil,
       dob: '10/29/1942',
       address1: '123 Sunnyside way',
@@ -36,7 +37,7 @@
     Proofing::Aamva::Applicant.from_proofer_applicant(**applicant_data.compact_blank)
   end
 
-  subject do
+  subject(:request) do
     described_class.new(
       applicant: applicant,
       session_id: transaction_id,
@@ -356,4 +357,29 @@
       end
     end
   end
+
+  describe 'compound last names' do
+    let(:last_name) { 'McFirst McSecond' }
+
+    subject(:rendered_last_name) do
+      body = REXML::Document.new(request.body)
+      REXML::XPath.first(body, '//nc:PersonSurName')&.text
+    end
+
+    before do
+      allow(IdentityConfig.store).to receive(:idv_aamva_split_last_name_states)
+        .and_return(['DC'])
+    end
+    it 'sends the full last name' do
+      expect(rendered_last_name).to eq('McFirst McSecond')
+    end
+
+    context 'in state configured for last name split' do
+      let(:state_id_jurisdiction) { 'DC' }
+
+      it 'only sends the first part of the last name' do
+        expect(rendered_last_name).to eq('McFirst')
+      end
+    end
+  end
 end