diff --git a/pymongo/pool_options.py b/pymongo/pool_options.py
index 5c24709b16..b6c1071f62 100644
--- a/pymongo/pool_options.py
+++ b/pymongo/pool_options.py
@@ -386,20 +386,26 @@ def __init__(
 
     def _update_metadata(self, driver: DriverInfo) -> None:
         """Updates the client's metadata"""
+        if driver.name and driver.name.lower() in self.__metadata["driver"]["name"].lower().split(
+            "|"
+        ):
+            return
 
         metadata = copy.deepcopy(self.__metadata)
-        if driver.name:
-            metadata["driver"]["name"] = "{}|{}".format(
-                metadata["driver"]["name"],
-                driver.name,
-            )
-        if driver.version:
-            metadata["driver"]["version"] = "{}|{}".format(
-                metadata["driver"]["version"],
-                driver.version,
-            )
-        if driver.platform:
-            metadata["platform"] = "{}|{}".format(metadata["platform"], driver.platform)
+
+        name = driver.name or ""
+        version = driver.version or ""
+        platform = driver.platform or ""
+
+        metadata["driver"]["name"] = "{}|{}".format(
+            metadata["driver"]["name"],
+            name,
+        )
+        metadata["driver"]["version"] = "{}|{}".format(
+            metadata["driver"]["version"],
+            version,
+        )
+        metadata["platform"] = "{}|{}".format(metadata["platform"], platform)
 
         self.__metadata = metadata
 
diff --git a/test/asynchronous/test_client.py b/test/asynchronous/test_client.py
index 52f16e0bcc..3a4c804220 100644
--- a/test/asynchronous/test_client.py
+++ b/test/asynchronous/test_client.py
@@ -372,6 +372,7 @@ async def test_metadata(self):
         else:
             metadata["driver"]["name"] = "PyMongo|async|FooDriver"
         metadata["driver"]["version"] = "{}|1.2.3".format(_METADATA["driver"]["version"])
+        metadata["platform"] = "{}|".format(_METADATA["platform"])
         client = self.simple_client(
             "foo",
             27017,
diff --git a/test/asynchronous/test_client_metadata.py b/test/asynchronous/test_client_metadata.py
index cfecb49748..18eb72b5bb 100644
--- a/test/asynchronous/test_client_metadata.py
+++ b/test/asynchronous/test_client_metadata.py
@@ -107,15 +107,20 @@ async def check_metadata_added(
         new_name, new_version, new_platform, new_metadata = await self.send_ping_and_get_metadata(
             client, True
         )
-        self.assertEqual(new_name, f"{name}|{add_name}" if add_name is not None else name)
-        self.assertEqual(
-            new_version,
-            f"{version}|{add_version}" if add_version is not None else version,
-        )
-        self.assertEqual(
-            new_platform,
-            f"{platform}|{add_platform}" if add_platform is not None else platform,
-        )
+        if add_name is not None and add_name.lower() in name.lower().split("|"):
+            self.assertEqual(name, new_name)
+            self.assertEqual(version, new_version)
+            self.assertEqual(platform, new_platform)
+        else:
+            self.assertEqual(new_name, f"{name}|{add_name}" if add_name is not None else f"{name}|")
+            self.assertEqual(
+                new_version,
+                f"{version}|{add_version}" if add_version is not None else f"{version}|",
+            )
+            self.assertEqual(
+                new_platform,
+                f"{platform}|{add_platform}" if add_platform is not None else f"{platform}|",
+            )
 
         metadata.pop("driver")
         metadata.pop("platform")
@@ -210,6 +215,18 @@ async def test_doesnt_update_established_connections(self):
         self.assertIsNone(self.handshake_req)
         self.assertEqual(listener.event_count(ConnectionClosedEvent), 0)
 
+    async def test_duplicate_driver_name_no_op(self):
+        client = await self.async_rs_or_single_client(
+            "mongodb://" + self.server.address_string,
+            maxIdleTimeMS=1,
+        )
+        client.append_metadata(DriverInfo("library", "1.2", "Library Platform"))
+        await self.check_metadata_added(client, "framework", None, None)
+        # wait for connection to become idle
+        await asyncio.sleep(0.005)
+        # add same metadata again
+        await self.check_metadata_added(client, "Framework", None, None)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/test/test_client.py b/test/test_client.py
index dd1bf94cf1..1c2ebcf13c 100644
--- a/test/test_client.py
+++ b/test/test_client.py
@@ -365,6 +365,7 @@ def test_metadata(self):
         else:
             metadata["driver"]["name"] = "PyMongo|FooDriver"
         metadata["driver"]["version"] = "{}|1.2.3".format(_METADATA["driver"]["version"])
+        metadata["platform"] = "{}|".format(_METADATA["platform"])
         client = self.simple_client(
             "foo",
             27017,
diff --git a/test/test_client_metadata.py b/test/test_client_metadata.py
index 32cb9b8009..5e1822d755 100644
--- a/test/test_client_metadata.py
+++ b/test/test_client_metadata.py
@@ -107,15 +107,20 @@ def check_metadata_added(
         new_name, new_version, new_platform, new_metadata = self.send_ping_and_get_metadata(
             client, True
         )
-        self.assertEqual(new_name, f"{name}|{add_name}" if add_name is not None else name)
-        self.assertEqual(
-            new_version,
-            f"{version}|{add_version}" if add_version is not None else version,
-        )
-        self.assertEqual(
-            new_platform,
-            f"{platform}|{add_platform}" if add_platform is not None else platform,
-        )
+        if add_name is not None and add_name.lower() in name.lower().split("|"):
+            self.assertEqual(name, new_name)
+            self.assertEqual(version, new_version)
+            self.assertEqual(platform, new_platform)
+        else:
+            self.assertEqual(new_name, f"{name}|{add_name}" if add_name is not None else f"{name}|")
+            self.assertEqual(
+                new_version,
+                f"{version}|{add_version}" if add_version is not None else f"{version}|",
+            )
+            self.assertEqual(
+                new_platform,
+                f"{platform}|{add_platform}" if add_platform is not None else f"{platform}|",
+            )
 
         metadata.pop("driver")
         metadata.pop("platform")
@@ -210,6 +215,18 @@ def test_doesnt_update_established_connections(self):
         self.assertIsNone(self.handshake_req)
         self.assertEqual(listener.event_count(ConnectionClosedEvent), 0)
 
+    def test_duplicate_driver_name_no_op(self):
+        client = self.rs_or_single_client(
+            "mongodb://" + self.server.address_string,
+            maxIdleTimeMS=1,
+        )
+        client.append_metadata(DriverInfo("library", "1.2", "Library Platform"))
+        self.check_metadata_added(client, "framework", None, None)
+        # wait for connection to become idle
+        time.sleep(0.005)
+        # add same metadata again
+        self.check_metadata_added(client, "Framework", None, None)
+
 
 if __name__ == "__main__":
     unittest.main()