diff --git a/src/Tree/Menu.jsx b/src/Tree/Menu.jsx
index 6181d6c..7f32843 100644
--- a/src/Tree/Menu.jsx
+++ b/src/Tree/Menu.jsx
@@ -7,7 +7,7 @@ function nameGen(name, occupied) {
   let n = 1;
   let newName = name;
   while (occupied && occupied.includes(newName)) {
-    newName = name + '_' + n;
+    newName = name + '#' + n;
     n += 1;
   }
   return newName;