diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelper.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelper.java
index 88d5576a77d..098b7e15fa9 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelper.java
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelper.java
@@ -193,7 +193,15 @@ private static void validateDirectEventNames(
     }
     for (String oldKey : keysToNormalize) {
       Object value = events.get(oldKey);
-      String newKey = "top" + oldKey.substring(0, 1).toUpperCase() + oldKey.substring(1);
+      String baseKey = "";
+      if (oldKey.startsWith("on")) {
+        // Drop "on" prefix.
+        baseKey = oldKey.substring(2);
+      } else {
+        // Capitalize first letter.
+        baseKey = oldKey.substring(0, 1).toUpperCase() + oldKey.substring(1);
+      }
+      String newKey = "top" + baseKey;
       events.put(newKey, value);
     }
   }
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelperTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelperTest.kt
index c4e00424285..2f3e0af7fe3 100644
--- a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelperTest.kt
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/UIManagerModuleConstantsHelperTest.kt
@@ -32,7 +32,7 @@ class UIManagerModuleConstantsHelperTest {
     val onClickMap: Map<String, String> =
         MapBuilder.builder<String, String>().put("onClick", "¯\\_(ツ)_/¯").build()
     UIManagerModuleConstantsHelper.normalizeEventTypes(onClickMap)
-    assertTrue(onClickMap.containsKey("topOnClick"))
+    assertTrue(onClickMap.containsKey("topClick"))
     assertTrue(onClickMap.containsKey("onClick"))
   }
 
@@ -58,8 +58,8 @@ class UIManagerModuleConstantsHelperTest {
                         "bubbled", "onColorChanged", "captured", "onColorChangedCapture")))
             .build()
     UIManagerModuleConstantsHelper.normalizeEventTypes(nestedObjects)
-    assertTrue(nestedObjects.containsKey("topOnColorChanged"))
-    var innerMap = nestedObjects["topOnColorChanged"] as? Map<String, Any?>
+    assertTrue(nestedObjects.containsKey("topColorChanged"))
+    var innerMap = nestedObjects["topColorChanged"] as? Map<String, Any?>
     assertNotNull(innerMap)
     assertTrue(innerMap!!.containsKey("phasedRegistrationNames"))
     var innerInnerMap = innerMap.get("phasedRegistrationNames") as? Map<String, Any?>
@@ -67,7 +67,7 @@ class UIManagerModuleConstantsHelperTest {
     assertEquals("onColorChanged", innerInnerMap!!.get("bubbled"))
     assertEquals("onColorChangedCapture", innerInnerMap.get("captured"))
     assertTrue(nestedObjects.containsKey("onColorChanged"))
-    innerMap = nestedObjects.get("topOnColorChanged") as? Map<String, Any?>
+    innerMap = nestedObjects.get("topColorChanged") as? Map<String, Any?>
     assertNotNull(innerMap)
     assertTrue(innerMap!!.containsKey("phasedRegistrationNames"))
     innerInnerMap = innerMap.get("phasedRegistrationNames") as? Map<String, Any?>
diff --git a/packages/react-native/ReactCommon/react/renderer/core/EventEmitter.cpp b/packages/react-native/ReactCommon/react/renderer/core/EventEmitter.cpp
index 8c3f9d83bf6..a06d7ba7656 100644
--- a/packages/react-native/ReactCommon/react/renderer/core/EventEmitter.cpp
+++ b/packages/react-native/ReactCommon/react/renderer/core/EventEmitter.cpp
@@ -16,6 +16,10 @@
 
 namespace facebook::react {
 
+static bool hasPrefix(const std::string& str, const std::string& prefix) {
+  return str.compare(0, prefix.length(), prefix) == 0;
+}
+
 // TODO(T29874519): Get rid of "top" prefix once and for all.
 /*
  * Capitalizes the first letter of the event type and adds "top" prefix if
@@ -23,11 +27,14 @@ namespace facebook::react {
  */
 static std::string normalizeEventType(std::string type) {
   auto prefixedType = std::move(type);
-  if (prefixedType.find("top", 0) != 0) {
-    prefixedType.insert(0, "top");
-    prefixedType[3] = static_cast<char>(toupper(prefixedType[3]));
+  if (facebook::react::hasPrefix(prefixedType, "top")) {
+    return prefixedType;
+  }
+  if (facebook::react::hasPrefix(prefixedType, "on")) {
+    return "top" + prefixedType.substr(2);
   }
-  return prefixedType;
+  prefixedType[0] = static_cast<char>(toupper(prefixedType[0]));
+  return "top" + prefixedType;
 }
 
 std::mutex& EventEmitter::DispatchMutex() {