Repository: pandas-dev/pandas (python)

Issue:
BUG: `ListAccessor` does not preserve series name
### Pandas version checks

- [X] I have checked that this issue has not already been reported.

- [X] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas.

- [ ] I have confirmed this bug exists on the [main branch](https://pandas.pydata.org/docs/dev/getting_started/install.html#installing-the-development-version-of-pandas) of pandas.


### Reproducible Example

```python
import pandas as pd
import pyarrow as pa

df = pd.DataFrame({
    "a": [[1,2,3], [4,5]],
    "b": ["hello", "pandas"]
}).astype({"a": pd.ArrowDtype(pa.list_(pa.int64()))})

df["a"].list.len().name, df["b"].str.len().name
# (None, "b")
```


### Issue Description

`ListAccessor` nullifies the series name (`list.len()` is just an example, other available methods lead to the same outcome).

### Expected Behavior

Series name to be preserved, as per other accessor (see `.str.len()` in the example)

### Installed Versions

TL;DR for relevant:
pandas                : 2.2.3
pyarrow               : 18.1.0
numpy                 : 2.1.3


INSTALLED VERSIONS
------------------
commit                : 0691c5cf90477d3503834d983f69350f250a6ff7
python                : 3.12.2
python-bits           : 64
OS                    : Linux
OS-release            : 5.15.133.1-microsoft-standard-WSL2
Version               : #1 SMP Thu Oct 5 21:02:42 UTC 2023
machine               : x86_64
processor             : x86_64
byteorder             : little
LC_ALL                : None
LANG                  : C.UTF-8
LOCALE                : C.UTF-8

pandas                : 2.2.3
numpy                 : 2.1.3
pytz                  : 2024.2
dateutil              : 2.9.0.post0
pip                   : None
Cython                : None
sphinx                : None
IPython               : 8.29.0
adbc-driver-postgresql: None
adbc-driver-sqlite    : None
bs4                   : 4.12.3
blosc                 : None
bottleneck            : None
dataframe-api-compat  : None
fastparquet           : None
fsspec                : 2024.10.0
html5lib              : None
hypothesis            : 6.122.1
gcsfs                 : None
jinja2                : 3.1.4
lxml.etree            : None
matplotlib            : 3.9.3
numba                 : None
numexpr               : None
odfpy                 : None
openpyxl              : None
pandas_gbq            : None
psycopg2              : None
pymysql               : None
pyarrow               : 18.1.0
pyreadstat            : None
pytest                : 8.3.4
python-calamine       : None
pyxlsb                : None
s3fs                  : None
scipy                 : 1.14.1
sqlalchemy            : None
tables                : None
tabulate              : None
xarray                : None
xlrd                  : 2.0.1
xlsxwriter            : None
zstandard             : None
tzdata                : 2024.2
qtpy                  : None
pyqt5                 : None

Pull request:
BUG: Fix `ListAccessor` methods to preserve original name
- [x] closes #60522
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions. - **NA**
- [x] Added an entry in the latest `doc/source/whatsnew/v3.0.0.rst` file if fixing a bug or adding a new feature.



Patch:
diff --git a/doc/source/reference/frame.rst b/doc/source/reference/frame.rst
index 7680c8b434..e701d48a89 100644
--- a/doc/source/reference/frame.rst
+++ b/doc/source/reference/frame.rst
@@ -185,7 +185,6 @@ Reindexing / selection / label manipulation
    DataFrame.duplicated
    DataFrame.equals
    DataFrame.filter
-   DataFrame.head
    DataFrame.idxmax
    DataFrame.idxmin
    DataFrame.reindex
@@ -196,7 +195,6 @@ Reindexing / selection / label manipulation
    DataFrame.sample
    DataFrame.set_axis
    DataFrame.set_index
-   DataFrame.tail
    DataFrame.take
    DataFrame.truncate
 
diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
index ab5746eca1..b799b7ea5c 100644
--- a/doc/source/whatsnew/v3.0.0.rst
+++ b/doc/source/whatsnew/v3.0.0.rst
@@ -798,6 +798,7 @@ Other
 - Bug in :meth:`read_csv` where chained fsspec TAR file and ``compression="infer"`` fails with ``tarfile.ReadError`` (:issue:`60028`)
 - Bug in Dataframe Interchange Protocol implementation was returning incorrect results for data buffers' associated dtype, for string and datetime columns (:issue:`54781`)
 - Bug in ``Series.list`` methods not preserving the original :class:`Index`. (:issue:`58425`)
+- Bug in ``Series.list`` methods not preserving the original name. (:issue:`60522`)
 - Bug in printing a :class:`DataFrame` with a :class:`DataFrame` stored in :attr:`DataFrame.attrs` raised a ``ValueError`` (:issue:`60455`)
 
 .. ***DO NOT USE THIS SECTION***
diff --git a/pandas/core/arrays/arrow/accessors.py b/pandas/core/arrays/arrow/accessors.py
index 230522846d..b220a94d03 100644
--- a/pandas/core/arrays/arrow/accessors.py
+++ b/pandas/core/arrays/arrow/accessors.py
@@ -117,7 +117,10 @@ class ListAccessor(ArrowAccessor):
 
         value_lengths = pc.list_value_length(self._pa_array)
         return Series(
-            value_lengths, dtype=ArrowDtype(value_lengths.type), index=self._data.index
+            value_lengths,
+            dtype=ArrowDtype(value_lengths.type),
+            index=self._data.index,
+            name=self._data.name,
         )
 
     def __getitem__(self, key: int | slice) -> Series:
@@ -162,7 +165,10 @@ class ListAccessor(ArrowAccessor):
             #     key = pc.add(key, pc.list_value_length(self._pa_array))
             element = pc.list_element(self._pa_array, key)
             return Series(
-                element, dtype=ArrowDtype(element.type), index=self._data.index
+                element,
+                dtype=ArrowDtype(element.type),
+                index=self._data.index,
+                name=self._data.name,
             )
         elif isinstance(key, slice):
             if pa_version_under11p0:
@@ -181,7 +187,12 @@ class ListAccessor(ArrowAccessor):
             if step is None:
                 step = 1
             sliced = pc.list_slice(self._pa_array, start, stop, step)
-            return Series(sliced, dtype=ArrowDtype(sliced.type), index=self._data.index)
+            return Series(
+                sliced,
+                dtype=ArrowDtype(sliced.type),
+                index=self._data.index,
+                name=self._data.name,
+            )
         else:
             raise ValueError(f"key must be an int or slice, got {type(key).__name__}")
 
@@ -223,7 +234,12 @@ class ListAccessor(ArrowAccessor):
         counts = pa.compute.list_value_length(self._pa_array)
         flattened = pa.compute.list_flatten(self._pa_array)
         index = self._data.index.repeat(counts.fill_null(pa.scalar(0, counts.type)))
-        return Series(flattened, dtype=ArrowDtype(flattened.type), index=index)
+        return Series(
+            flattened,
+            dtype=ArrowDtype(flattened.type),
+            index=index,
+            name=self._data.name,
+        )
 
 
 class StructAccessor(ArrowAccessor):
diff --git a/pandas/core/computation/pytables.py b/pandas/core/computation/pytables.py
index fe7e27f537..4a75acce46 100644
--- a/pandas/core/computation/pytables.py
+++ b/pandas/core/computation/pytables.py
@@ -205,7 +205,7 @@ class BinOp(ops.BinOp):
         val = v.tostring(self.encoding)
         return f"({self.lhs} {self.op} {val})"
 
-    def convert_value(self, v) -> TermValue:
+    def convert_value(self, conv_val) -> TermValue:
         """
         convert the expression that is in the term to something that is
         accepted by pytables
@@ -219,44 +219,44 @@ class BinOp(ops.BinOp):
         kind = ensure_decoded(self.kind)
         meta = ensure_decoded(self.meta)
         if kind == "datetime" or (kind and kind.startswith("datetime64")):
-            if isinstance(v, (int, float)):
-                v = stringify(v)
-            v = ensure_decoded(v)
-            v = Timestamp(v).as_unit("ns")
-            if v.tz is not None:
-                v = v.tz_convert("UTC")
-            return TermValue(v, v._value, kind)
+            if isinstance(conv_val, (int, float)):
+                conv_val = stringify(conv_val)
+            conv_val = ensure_decoded(conv_val)
+            conv_val = Timestamp(conv_val).as_unit("ns")
+            if conv_val.tz is not None:
+                conv_val = conv_val.tz_convert("UTC")
+            return TermValue(conv_val, conv_val._value, kind)
         elif kind in ("timedelta64", "timedelta"):
-            if isinstance(v, str):
-                v = Timedelta(v)
+            if isinstance(conv_val, str):
+                conv_val = Timedelta(conv_val)
             else:
-                v = Timedelta(v, unit="s")
-            v = v.as_unit("ns")._value
-            return TermValue(int(v), v, kind)
+                conv_val = Timedelta(conv_val, unit="s")
+            conv_val = conv_val.as_unit("ns")._value
+            return TermValue(int(conv_val), conv_val, kind)
         elif meta == "category":
             metadata = extract_array(self.metadata, extract_numpy=True)
             result: npt.NDArray[np.intp] | np.intp | int
-            if v not in metadata:
+            if conv_val not in metadata:
                 result = -1
             else:
-                result = metadata.searchsorted(v, side="left")
+                result = metadata.searchsorted(conv_val, side="left")
             return TermValue(result, result, "integer")
         elif kind == "integer":
             try:
-                v_dec = Decimal(v)
+                v_dec = Decimal(conv_val)
             except InvalidOperation:
                 # GH 54186
                 # convert v to float to raise float's ValueError
-                float(v)
+                float(conv_val)
             else:
-                v = int(v_dec.to_integral_exact(rounding="ROUND_HALF_EVEN"))
-            return TermValue(v, v, kind)
+                conv_val = int(v_dec.to_integral_exact(rounding="ROUND_HALF_EVEN"))
+            return TermValue(conv_val, conv_val, kind)
         elif kind == "float":
-            v = float(v)
-            return TermValue(v, v, kind)
+            conv_val = float(conv_val)
+            return TermValue(conv_val, conv_val, kind)
         elif kind == "bool":
-            if isinstance(v, str):
-                v = v.strip().lower() not in [
+            if isinstance(conv_val, str):
+                conv_val = conv_val.strip().lower() not in [
                     "false",
                     "f",
                     "no",
@@ -268,13 +268,13 @@ class BinOp(ops.BinOp):
                     "",
                 ]
             else:
-                v = bool(v)
-            return TermValue(v, v, kind)
-        elif isinstance(v, str):
+                conv_val = bool(conv_val)
+            return TermValue(conv_val, conv_val, kind)
+        elif isinstance(conv_val, str):
             # string quoting
-            return TermValue(v, stringify(v), "string")
+            return TermValue(conv_val, stringify(conv_val), "string")
         else:
-            raise TypeError(f"Cannot compare {v} of type {type(v)} to {kind} column")
+            raise TypeError(f"Cannot compare {conv_val} of type {type(conv_val)} to {kind} column")
 
     def convert_values(self) -> None:
         pass


Test patch:
diff --git a/pandas/tests/series/accessors/test_list_accessor.py b/pandas/tests/series/accessors/test_list_accessor.py
index c153e800cb..bec8ca13a2 100644
--- a/pandas/tests/series/accessors/test_list_accessor.py
+++ b/pandas/tests/series/accessors/test_list_accessor.py
@@ -25,9 +25,10 @@ def test_list_getitem(list_dtype):
     ser = Series(
         [[1, 2, 3], [4, None, 5], None],
         dtype=ArrowDtype(list_dtype),
+        name="a",
     )
     actual = ser.list[1]
-    expected = Series([2, None, None], dtype="int64[pyarrow]")
+    expected = Series([2, None, None], dtype="int64[pyarrow]", name="a")
     tm.assert_series_equal(actual, expected)
 
 
@@ -37,9 +38,15 @@ def test_list_getitem_index():
         [[1, 2, 3], [4, None, 5], None],
         dtype=ArrowDtype(pa.list_(pa.int64())),
         index=[1, 3, 7],
+        name="a",
     )
     actual = ser.list[1]
-    expected = Series([2, None, None], dtype="int64[pyarrow]", index=[1, 3, 7])
+    expected = Series(
+        [2, None, None],
+        dtype="int64[pyarrow]",
+        index=[1, 3, 7],
+        name="a",
+    )
     tm.assert_series_equal(actual, expected)
 
 
@@ -48,6 +55,7 @@ def test_list_getitem_slice():
         [[1, 2, 3], [4, None, 5], None],
         dtype=ArrowDtype(pa.list_(pa.int64())),
         index=[1, 3, 7],
+        name="a",
     )
     if pa_version_under11p0:
         with pytest.raises(
@@ -60,6 +68,7 @@ def test_list_getitem_slice():
             [[2, 3], [None, 5], None],
             dtype=ArrowDtype(pa.list_(pa.int64())),
             index=[1, 3, 7],
+            name="a",
         )
         tm.assert_series_equal(actual, expected)
 
@@ -68,9 +77,10 @@ def test_list_len():
     ser = Series(
         [[1, 2, 3], [4, None], None],
         dtype=ArrowDtype(pa.list_(pa.int64())),
+        name="a",
     )
     actual = ser.list.len()
-    expected = Series([3, 2, None], dtype=ArrowDtype(pa.int32()))
+    expected = Series([3, 2, None], dtype=ArrowDtype(pa.int32()), name="a")
     tm.assert_series_equal(actual, expected)
 
 
@@ -78,12 +88,14 @@ def test_list_flatten():
     ser = Series(
         [[1, 2, 3], None, [4, None], [], [7, 8]],
         dtype=ArrowDtype(pa.list_(pa.int64())),
+        name="a",
     )
     actual = ser.list.flatten()
     expected = Series(
         [1, 2, 3, 4, None, 7, 8],
         dtype=ArrowDtype(pa.int64()),
         index=[0, 0, 0, 2, 2, 4, 4],
+        name="a",
     )
     tm.assert_series_equal(actual, expected)