diff --git a/swh/graphql/resolvers/directory_entry.py b/swh/graphql/resolvers/directory_entry.py
--- a/swh/graphql/resolvers/directory_entry.py
+++ b/swh/graphql/resolvers/directory_entry.py
@@ -56,6 +56,8 @@
         if name_include is not None:
             # STORAGE-TODO, move this filter to swh-storage
             entries = [
-                x for x in entries if name_include.lower().encode() in x.name.lower()
+                x
+                for x in entries
+                if name_include.casefold() in x.name.decode().casefold()
             ]
         return utils.paginated(entries, self._get_first_arg(), self._get_after_arg())
diff --git a/swh/graphql/tests/data.py b/swh/graphql/tests/data.py
--- a/swh/graphql/tests/data.py
+++ b/swh/graphql/tests/data.py
@@ -127,6 +127,21 @@
     ]
 
 
+def get_directories_with_speical_name_entries():
+    return [
+        Directory(
+            entries=(
+                DirectoryEntry(
+                    name=b"\xc3\x9f\xc3\x9f\xc3\xa9tE\xc3\x89t",
+                    perms=0o644,
+                    type="file",
+                    target=get_contents()[0].sha1_git,
+                ),
+            )
+        )
+    ]
+
+
 def get_visit_with_multiple_status():
     return [
         OriginVisitStatus(
@@ -144,7 +159,8 @@
 GRAPHQL_EXTRA_TEST_OBJECTS = {
     "release": get_releases_with_target(),
     "revision": get_revisions_with_parents(),
-    "directory": get_directories_with_nested_path(),
+    "directory": get_directories_with_nested_path()
+    + get_directories_with_speical_name_entries(),
     "origin_visit_status": get_visit_with_multiple_status(),
 }
 
diff --git a/swh/graphql/tests/functional/test_directory_entry.py b/swh/graphql/tests/functional/test_directory_entry.py
--- a/swh/graphql/tests/functional/test_directory_entry.py
+++ b/swh/graphql/tests/functional/test_directory_entry.py
@@ -9,7 +9,11 @@
 from swh.model.swhids import CoreSWHID, ObjectType
 
 from . import utils
-from ..data import get_directories, get_directories_with_nested_path
+from ..data import (
+    get_directories,
+    get_directories_with_nested_path,
+    get_directories_with_speical_name_entries,
+)
 
 
 def get_target_type(target_type):
@@ -125,7 +129,9 @@
         assert each_entry in directory_entries
 
 
-@pytest.mark.parametrize("directory", get_directories())
+@pytest.mark.parametrize(
+    "directory", get_directories() + get_directories_with_speical_name_entries()
+)
 def test_directory_entry_connection_filter_by_name(client, directory):
     storage = server.get_storage()
     for dir_entry in storage.directory_ls(directory.id):