diff --git a/litellm/router.py b/litellm/router.py
index b1337159e57..69e3e994dcd 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -2019,6 +2019,16 @@ class Router:
                     merged_tags.append(tag)
             kwargs[metadata_variable_name]["tags"] = merged_tags
 
+        ## CREDENTIAL NAME AS TAG
+        credential_name = deployment.get("litellm_params", {}).get(
+            "litellm_credential_name"
+        )
+        if credential_name:
+            existing_tags = kwargs[metadata_variable_name].get("tags") or []
+            if credential_name not in existing_tags:
+                existing_tags.append(credential_name)
+            kwargs[metadata_variable_name]["tags"] = existing_tags
+
         kwargs["model_info"] = model_info
 
         kwargs["timeout"] = self._get_timeout(
diff --git a/tests/test_litellm/litellm_core_utils/test_get_litellm_params.py b/tests/test_litellm/litellm_core_utils/test_get_litellm_params.py
index dbcb048c250..b39943b3e49 100644
--- a/tests/test_litellm/litellm_core_utils/test_get_litellm_params.py
+++ b/tests/test_litellm/litellm_core_utils/test_get_litellm_params.py
@@ -125,3 +125,4 @@ class TestGetLitellmParamsExplicitFields:
     def test_no_log_from_explicit_param(self):
         result = get_litellm_params(no_log=True)
         assert result["no-log"] is True
+
diff --git a/tests/test_litellm/litellm_core_utils/test_litellm_logging.py b/tests/test_litellm/litellm_core_utils/test_litellm_logging.py
index 734d52918ba..3cc91869289 100644
--- a/tests/test_litellm/litellm_core_utils/test_litellm_logging.py
+++ b/tests/test_litellm/litellm_core_utils/test_litellm_logging.py
@@ -1355,3 +1355,5 @@ def test_get_error_information_error_code_priority():
     result = StandardLoggingPayloadSetup.get_error_information(no_code_exception)
     assert result["error_code"] == ""
     assert result["error_class"] == "NoCodeException"
+
+
diff --git a/tests/test_litellm/test_router.py b/tests/test_litellm/test_router.py
index c55b26ca39c..f0e754cee82 100644
--- a/tests/test_litellm/test_router.py
+++ b/tests/test_litellm/test_router.py
@@ -2186,3 +2186,80 @@ def test_update_kwargs_with_deployment_merge_tools_request_overrides_tool_choice
 
     # Request tool_choice should be preserved (merged tools still applied)
     assert kwargs["tool_choice"] == "none"
+
+
+def test_credential_name_injected_as_tag():
+    """
+    Test that litellm_credential_name from deployment litellm_params
+    is injected as a tag into metadata during _update_kwargs_with_deployment.
+    """
+    router = litellm.Router(
+        model_list=[
+            {
+                "model_name": "xai-model",
+                "litellm_params": {
+                    "model": "xai/grok-4-1-fast",
+                    "litellm_credential_name": "xAI",
+                },
+            }
+        ],
+    )
+
+    kwargs: dict = {"metadata": {"tags": ["A.101"]}}
+    deployment = router.get_deployment_by_model_group_name(
+        model_group_name="xai-model"
+    )
+    router._update_kwargs_with_deployment(deployment=deployment, kwargs=kwargs)
+
+    assert "xAI" in kwargs["metadata"]["tags"]
+    assert "A.101" in kwargs["metadata"]["tags"]
+
+
+def test_credential_name_not_duplicated_in_tags():
+    """
+    Test that if the credential name already exists in the tags list,
+    it is not duplicated.
+    """
+    router = litellm.Router(
+        model_list=[
+            {
+                "model_name": "xai-model",
+                "litellm_params": {
+                    "model": "xai/grok-4-1-fast",
+                    "litellm_credential_name": "xAI",
+                },
+            }
+        ],
+    )
+
+    kwargs: dict = {"metadata": {"tags": ["xAI", "A.101"]}}
+    deployment = router.get_deployment_by_model_group_name(
+        model_group_name="xai-model"
+    )
+    router._update_kwargs_with_deployment(deployment=deployment, kwargs=kwargs)
+
+    assert kwargs["metadata"]["tags"].count("xAI") == 1
+
+
+def test_credential_name_not_injected_when_absent():
+    """
+    Test that when no litellm_credential_name is set, tags are unchanged.
+    """
+    router = litellm.Router(
+        model_list=[
+            {
+                "model_name": "gpt-model",
+                "litellm_params": {
+                    "model": "gpt-4o",
+                },
+            }
+        ],
+    )
+
+    kwargs: dict = {"metadata": {"tags": ["A.101"]}}
+    deployment = router.get_deployment_by_model_group_name(
+        model_group_name="gpt-model"
+    )
+    router._update_kwargs_with_deployment(deployment=deployment, kwargs=kwargs)
+
+    assert kwargs["metadata"]["tags"] == ["A.101"]