diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index babdf51..70b0180 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -96,7 +96,7 @@ jobs:
       # carries, or a change to them is not exercised until after it merges.
       # Consumers use the action; this repository owns the rules.
       - name: Refuse a skip, and a suite that shrank
-        run: tools/check-test-outcome.py "$RUNNER_TEMP/pytest.log" --min-tests 292
+        run: tools/check-test-outcome.py "$RUNNER_TEMP/pytest.log" --min-tests 293
 
       # The rules earn their place by refusing a log that carries what they
       # name. Both fixtures are written here rather than tracked, and the
diff --git a/parser/object_model.py b/parser/object_model.py
index 102e48e..ed7698f 100644
--- a/parser/object_model.py
+++ b/parser/object_model.py
@@ -214,11 +214,18 @@ def _role(fn_name: str) -> str:
 _OONAME_OVERRIDES: dict[str, str] = {}
 
 
-def _strip_class_token(fn_name: str, cls: str) -> str:
+def _strip_class_token(fn_name: str, cls: str, prefix: str = "") -> str:
     """Drop the class prefix the function-name object model encodes, leaving
-    the bare member name. Tries the class's own lower-cased token first, then
-    the generic superclass tokens, longest match wins."""
-    tokens = sorted({cls.lower(), *_GENERIC_TOKENS}, key=len, reverse=True)
+    the bare member name. Tries the prefix the classifier matched and the
+    class's own lower-cased token, then the generic superclass tokens, longest
+    match wins.
+
+    The matched prefix is what a class whose C prefix is not its lower-cased
+    name is reached by — `geom_*` for Geometry, `geog_*` for Geography — and
+    without it those members keep the prefix twice over, as `geomBuffer` on a
+    Geometry."""
+    tokens = sorted({cls.lower(), prefix, *_GENERIC_TOKENS} - {""},
+                    key=len, reverse=True)
     for tok in tokens:
         if fn_name == tok:
             return ""
@@ -241,11 +248,11 @@ def _camel(member: str) -> str:
     return "".join(out)
 
 
-def _ooname(fn_name: str, cls: str) -> str:
+def _ooname(fn_name: str, cls: str, prefix: str = "") -> str:
     """Canonical camelCase OO method name for a classified function."""
     if fn_name in _OONAME_OVERRIDES:
         return _OONAME_OVERRIDES[fn_name]
-    return _camel(_strip_class_token(fn_name, cls))
+    return _camel(_strip_class_token(fn_name, cls, prefix))
 
 
 def _oo_excluded(fn: dict, role: str) -> bool:
@@ -533,7 +540,7 @@ def attach_object_model(idl: dict, path: Path,
         role = _role(name)
         method = {"function": name, "role": role,
                   "scope": tgt["scope"], "backing": name,
-                  "ooName": _ooname(name, cls)}
+                  "ooName": _ooname(name, cls, pref)}
         if _oo_excluded(fn, role):
             method["ooExclude"] = True
         sugar = []
diff --git a/tests/test_object_model.py b/tests/test_object_model.py
index 3595809..ae44175 100644
--- a/tests/test_object_model.py
+++ b/tests/test_object_model.py
@@ -195,6 +195,23 @@ def test_internal_api_methods_are_excluded(self):
         self.assertNotIn("ooExclude", meths["temporal_num_instants"])
         self.assertTrue(meths["temporal_inst_n"].get("ooExclude"))
 
+    def test_ooname_drops_the_prefix_the_classifier_matched(self):
+        # A class reached by a prefix that is not its lower-cased name —
+        # `geom_*` for Geometry, `geog_*` for Geography, `geoset_*` for
+        # GeomSet — otherwise keeps that prefix in the member name, so the
+        # method reads `geometry.geomBuffer()`.
+        om = attach_object_model({"functions": [
+            {"name": "geom_from_hexewkb"}, {"name": "geog_from_hexewkb"},
+            {"name": "geoset_start_value"}, {"name": "set_set_subspan"},
+        ]}, MODEL, None)["objectModel"]
+        names = {m["function"]: m["ooName"]
+                 for s in om["classes"].values() for m in s["methods"]}
+        self.assertEqual(names["geom_from_hexewkb"], "fromHexewkb")
+        self.assertEqual(names["geog_from_hexewkb"], "fromHexewkb")
+        self.assertEqual(names["geoset_start_value"], "startValue")
+        # One token is dropped, not every repetition of it.
+        self.assertEqual(names["set_set_subspan"], "setSubspan")
+
     def test_class_ctype_comes_from_the_receiver(self):
         # A receiver-role method takes the value it is called on first, so its
         # pointee names what the class's instances are — which is what a