FIX-#7375: Fix Series.duplicated dropping name

Signed-off-by: Jonathan Shi <[email protected]>

modin/pandas/series.py

@@ -1022,7 +1022,11 @@ def duplicated(self, keep="first") -> Series:  # noqa: PR01, RT01, D200
         """
         Indicate duplicate Series values.
         """
-        return self.to_frame().duplicated(keep=keep)
+        name = self.name
+        result = self.to_frame().duplicated(keep=keep)
+        # DataFrame.duplicated drops the name, so we need to manually restore it
+        result.name = name
+        return result
 
     def eq(
         self, other, level=None, fill_value=None, axis=0

modin/tests/pandas/test_series.py

@@ -1942,6 +1942,12 @@ def test_duplicated(data, keep):
     df_equals(modin_result, pandas_series.duplicated(keep=keep))
 
 
+def test_duplicated_keeps_name_issue_7375():
+    # Ensure that the name property of a series is preserved across duplicated
+    modin_series, pandas_series = create_test_series([1, 2, 3, 1], name="a")
+    df_equals(modin_series.duplicated(), pandas_series.duplicated())
+
+
 @pytest.mark.parametrize("data", test_data_values, ids=test_data_keys)
 def test_empty(data):
     modin_series, pandas_series = create_test_series(data)