diff --git a/pyegeria/omvs/data_discovery.py b/pyegeria/omvs/data_discovery.py
index 07cc9f63..b3bf4338 100644
--- a/pyegeria/omvs/data_discovery.py
+++ b/pyegeria/omvs/data_discovery.py
@@ -1725,7 +1725,7 @@ def delete_analysis_report(self, report_guid: str, body: Optional[dict | DeleteE
     async def _async_get_analysis_reports_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get analysis reports by name. Async version."""
         url = f"{self.platform_url}/servers/{self.view_server}/api/open-metadata/data-discovery/analysis-reports/by-name"
-        return await self._async_get_name_request(url, _type="AnalysisReport", _gen_output=self._generate_annotation_output, name=name, start_from=start_from, page_size=page_size, **kwargs)
+        return await self._async_get_name_request(url, _type="AnalysisReport", _gen_output=self._generate_annotation_output, filter_string=name, start_from=start_from, page_size=page_size, **kwargs)
 
     def get_analysis_reports_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get analysis reports by name."""
diff --git a/pyegeria/omvs/schema_maker.py b/pyegeria/omvs/schema_maker.py
index 42a7997c..49b9ffa3 100644
--- a/pyegeria/omvs/schema_maker.py
+++ b/pyegeria/omvs/schema_maker.py
@@ -486,7 +486,7 @@ def create_schema_attribute_from_template(self, body: dict | TemplateRequestBody
     async def _async_get_schema_types_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get schema types by name. Async version."""
         url = f"{self.platform_url}/servers/{self.view_server}/api/open-metadata/schema-maker/schema-types/by-name"
-        return await self._async_get_name_request(url, _type="SchemaType", _gen_output=self._generate_schema_output, name=name, start_from=start_from, page_size=page_size, **kwargs)
+        return await self._async_get_name_request(url, _type="SchemaType", _gen_output=self._generate_schema_output, filter_string=name, start_from=start_from, page_size=page_size, **kwargs)
 
     def get_schema_types_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get schema types by name."""
@@ -497,7 +497,7 @@ def get_schema_types_by_name(self, name: str, start_from: int = 0, page_size: in
     async def _async_get_schema_attributes_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get schema attributes by name. Async version."""
         url = f"{self.platform_url}/servers/{self.view_server}/api/open-metadata/schema-maker/schema-attributes/by-name"
-        return await self._async_get_name_request(url, _type="SchemaAttribute", _gen_output=self._generate_schema_output, name=name, start_from=start_from, page_size=page_size, **kwargs)
+        return await self._async_get_name_request(url, _type="SchemaAttribute", _gen_output=self._generate_schema_output, filter_string=name, start_from=start_from, page_size=page_size, **kwargs)
 
     def get_schema_attributes_by_name(self, name: str, start_from: int = 0, page_size: int = 100, **kwargs) -> list | str:
         """Get schema attributes by name."""
diff --git a/tests/micro-tests/test_get_by_name_filter_string.py b/tests/micro-tests/test_get_by_name_filter_string.py
new file mode 100644
index 00000000..2bb30938
--- /dev/null
+++ b/tests/micro-tests/test_get_by_name_filter_string.py
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright Contributors to the ODPi Egeria project.
+"""
+The shared _async_get_name_request helper takes the name to match as
+``filter_string``. Callers that passed it as ``name=`` put it in **kwargs
+instead, so the request went out with a null filter and Egeria rejected it
+(OPEN-METADATA-400-004 ... getSchemaTypesByName ... is null). Confirmed live
+for SchemaMaker.get_schema_types_by_name.
+"""
+from typing import Any, cast
+
+import pytest
+
+from pyegeria.omvs.data_discovery import DataDiscovery
+from pyegeria.omvs.schema_maker import SchemaMaker
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("cls, method", [
+    (SchemaMaker, "_async_get_schema_types_by_name"),
+    (SchemaMaker, "_async_get_schema_attributes_by_name"),
+    (DataDiscovery, "_async_get_analysis_reports_by_name"),
+])
+async def test_name_is_sent_as_filter_string(cls, method):
+    captured = {}
+
+    async def fake_get_name_request(url, **kwargs):
+        captured.update(kwargs)
+        return []
+
+    client = cls.__new__(cls)
+    client.platform_url = "https://localhost:9443"
+    client.view_server = "qs-view-server"
+    client._async_get_name_request = fake_get_name_request
+
+    await getattr(cls, method)(cast(Any, client), "QN::Example")
+
+    assert captured["filter_string"] == "QN::Example"
+    assert "name" not in captured