@@ -80,7 +80,7 @@
     Union,
 )
 
-from git.types import Commit_ish, Literal, PathLike
+from git.types import Old_commit_ish, Literal, PathLike
 
 if TYPE_CHECKING:
     from subprocess import Popen
@@ -1127,7 +1127,7 @@ def move(
     def commit(
         self,
         message: str,
-        parent_commits: Union[Commit_ish, None] = None,
+        parent_commits: Union[Old_commit_ish, None] = None,
         head: bool = True,
         author: Union[None, "Actor"] = None,
         committer: Union[None, "Actor"] = None,
 
@@ -16,7 +16,7 @@
 
 from typing import Any, TYPE_CHECKING, Union
 
-from git.types import PathLike, Commit_ish, Lit_commit_ish
+from git.types import PathLike, Old_commit_ish, Lit_old_commit_ish
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -53,7 +53,7 @@ class Object(LazyMixin):
     * "tag object": https://git-scm.com/docs/gitglossary#def_tag_object
 
     :note:
-        See the :class:`~git.types.Commit_ish` union type.
+        See the :class:`~git.types.Old_commit_ish` union type.
 
     :note:
         :class:`~git.objects.submodule.base.Submodule` is defined under the hierarchy
@@ -77,7 +77,7 @@ class Object(LazyMixin):
 
     __slots__ = ("repo", "binsha", "size")
 
-    type: Union[Lit_commit_ish, None] = None
+    type: Union[Lit_old_commit_ish, None] = None
     """String identifying (a concrete :class:`Object` subtype for) a git object type.
 
     The subtypes that this may name correspond to the kinds of git objects that exist,
@@ -90,7 +90,7 @@ class Object(LazyMixin):
         ``None`` in concrete leaf subclasses representing specific git object types.
 
     :note:
-        See also :class:`~git.types.Commit_ish`.
+        See also :class:`~git.types.Old_commit_ish`.
     """
 
     def __init__(self, repo: "Repo", binsha: bytes):
@@ -113,7 +113,7 @@ def __init__(self, repo: "Repo", binsha: bytes):
         )
 
     @classmethod
-    def new(cls, repo: "Repo", id: Union[str, "Reference"]) -> Commit_ish:
+    def new(cls, repo: "Repo", id: Union[str, "Reference"]) -> Old_commit_ish:
         """
         :return:
             New :class:`Object` instance of a type appropriate to the object type behind
@@ -130,7 +130,7 @@ def new(cls, repo: "Repo", id: Union[str, "Reference"]) -> Commit_ish:
         return repo.rev_parse(str(id))
 
     @classmethod
-    def new_from_sha(cls, repo: "Repo", sha1: bytes) -> Commit_ish:
+    def new_from_sha(cls, repo: "Repo", sha1: bytes) -> Old_commit_ish:
         """
         :return:
             New object instance of a type appropriate to represent the given binary sha1
 
@@ -45,7 +45,7 @@
 from typing import Callable, Dict, Mapping, Sequence, TYPE_CHECKING, cast
 from typing import Any, Iterator, Union
 
-from git.types import Commit_ish, Literal, PathLike, TBD
+from git.types import Old_commit_ish, Literal, PathLike, TBD
 
 if TYPE_CHECKING:
     from git.index import IndexFile
@@ -112,7 +112,7 @@ def __init__(
         mode: Union[int, None] = None,
         path: Union[PathLike, None] = None,
         name: Union[str, None] = None,
-        parent_commit: Union[Commit_ish, None] = None,
+        parent_commit: Union[Old_commit_ish, None] = None,
         url: Union[str, None] = None,
         branch_path: Union[PathLike, None] = None,
     ) -> None:
@@ -213,7 +213,7 @@ def __repr__(self) -> str:
 
     @classmethod
     def _config_parser(
-        cls, repo: "Repo", parent_commit: Union[Commit_ish, None], read_only: bool
+        cls, repo: "Repo", parent_commit: Union[Old_commit_ish, None], read_only: bool
     ) -> SubmoduleConfigParser:
         """
         :return:
@@ -264,7 +264,7 @@ def _clear_cache(self) -> None:
         # END for each name to delete
 
     @classmethod
-    def _sio_modules(cls, parent_commit: Commit_ish) -> BytesIO:
+    def _sio_modules(cls, parent_commit: Old_commit_ish) -> BytesIO:
         """
         :return:
             Configuration file as :class:`~io.BytesIO` - we only access it through the
@@ -277,7 +277,7 @@ def _sio_modules(cls, parent_commit: Commit_ish) -> BytesIO:
     def _config_parser_constrained(self, read_only: bool) -> SectionConstraint:
         """:return: Config parser constrained to our submodule in read or write mode"""
         try:
-            pc: Union["Commit_ish", None] = self.parent_commit
+            pc: Union["Old_commit_ish", None] = self.parent_commit
         except ValueError:
             pc = None
         # END handle empty parent repository
@@ -1242,7 +1242,7 @@ def remove(
 
         return self
 
-    def set_parent_commit(self, commit: Union[Commit_ish, None], check: bool = True) -> "Submodule":
+    def set_parent_commit(self, commit: Union[Old_commit_ish, None], check: bool = True) -> "Submodule":
         """Set this instance to use the given commit whose tree is supposed to
         contain the ``.gitmodules`` blob.
 
@@ -1495,7 +1495,7 @@ def url(self) -> str:
         return self._url
 
     @property
-    def parent_commit(self) -> "Commit_ish":
+    def parent_commit(self) -> "Old_commit_ish":
         """
         :return:
             :class:`~git.objects.commit.Commit` instance with the tree containing the
@@ -1557,7 +1557,7 @@ def children(self) -> IterableList["Submodule"]:
     def iter_items(
         cls,
         repo: "Repo",
-        parent_commit: Union[Commit_ish, str] = "HEAD",
+        parent_commit: Union[Old_commit_ish, str] = "HEAD",
         *Args: Any,
         **kwargs: Any,
     ) -> Iterator["Submodule"]:
 
@@ -12,7 +12,7 @@
 
 from typing import TYPE_CHECKING, Union
 
-from git.types import Commit_ish
+from git.types import Old_commit_ish
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -77,7 +77,7 @@ def _clear_cache(self) -> None:
 
     def update(  # type: ignore[override]
         self,
-        previous_commit: Union[Commit_ish, None] = None,
+        previous_commit: Union[Old_commit_ish, None] = None,
         recursive: bool = True,
         force_remove: bool = False,
         init: bool = True,
 
@@ -17,7 +17,7 @@
 
 from typing import Any, Sequence, Union, TYPE_CHECKING
 
-from git.types import PathLike, Commit_ish
+from git.types import PathLike, Old_commit_ish
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -62,7 +62,7 @@ def orig_head(self) -> SymbolicReference:
 
     def reset(
         self,
-        commit: Union[Commit_ish, SymbolicReference, str] = "HEAD",
+        commit: Union[Old_commit_ish, SymbolicReference, str] = "HEAD",
         index: bool = True,
         working_tree: bool = False,
         paths: Union[PathLike, Sequence[PathLike], None] = None,
 
@@ -11,7 +11,7 @@
 # typing ------------------------------------------------------------------
 
 from typing import Any, Callable, Iterator, Type, Union, TYPE_CHECKING
-from git.types import Commit_ish, PathLike, _T
+from git.types import Old_commit_ish, PathLike, _T
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -81,7 +81,7 @@ def __str__(self) -> str:
     # @ReservedAssignment
     def set_object(
         self,
-        object: Union[Commit_ish, "SymbolicReference", str],
+        object: Union[Old_commit_ish, "SymbolicReference", str],
         logmsg: Union[str, None] = None,
     ) -> "Reference":
         """Special version which checks if the head-log needs an update as well.
 
@@ -31,7 +31,7 @@
     TYPE_CHECKING,
     cast,
 )
-from git.types import Commit_ish, PathLike
+from git.types import Old_commit_ish, PathLike
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -278,7 +278,7 @@ def _get_ref_info(cls, repo: "Repo", ref_path: Union[PathLike, None]) -> Union[T
         """
         return cls._get_ref_info_helper(repo, ref_path)
 
-    def _get_object(self) -> Commit_ish:
+    def _get_object(self) -> Old_commit_ish:
         """
         :return:
             The object our ref currently refers to. Refs can be cached, they will always
@@ -345,7 +345,7 @@ def set_commit(
 
     def set_object(
         self,
-        object: Union[Commit_ish, "SymbolicReference", str],
+        object: Union[Old_commit_ish, "SymbolicReference", str],
         logmsg: Union[str, None] = None,
     ) -> "SymbolicReference":
         """Set the object we point to, possibly dereference our symbolic reference
@@ -404,7 +404,7 @@ def _get_reference(self) -> "SymbolicReference":
 
     def set_reference(
         self,
-        ref: Union[Commit_ish, "SymbolicReference", str],
+        ref: Union[Old_commit_ish, "SymbolicReference", str],
         logmsg: Union[str, None] = None,
     ) -> "SymbolicReference":
         """Set ourselves to the given `ref`.
 
@@ -15,7 +15,7 @@
 # typing ------------------------------------------------------------------
 
 from typing import Any, Type, Union, TYPE_CHECKING
-from git.types import Commit_ish, PathLike
+from git.types import Old_commit_ish, PathLike
 
 if TYPE_CHECKING:
     from git.repo import Repo
@@ -82,7 +82,7 @@ def tag(self) -> Union["TagObject", None]:
 
     # Make object read-only. It should be reasonably hard to adjust an existing tag.
     @property
-    def object(self) -> Commit_ish:  # type: ignore[override]
+    def object(self) -> Old_commit_ish:  # type: ignore[override]
         return Reference._get_object(self)
 
     @classmethod
 
@@ -41,7 +41,7 @@
     overload,
 )
 
-from git.types import PathLike, Literal, Commit_ish
+from git.types import PathLike, Literal, Old_commit_ish
 
 if TYPE_CHECKING:
     from git.repo.base import Repo
@@ -196,7 +196,7 @@ def __init__(
         self.summary = summary
 
     @property
-    def old_commit(self) -> Union[str, SymbolicReference, Commit_ish, None]:
+    def old_commit(self) -> Union[str, SymbolicReference, Old_commit_ish, None]:
         return self._old_commit_sha and self._remote.repo.commit(self._old_commit_sha) or None
 
     @property
@@ -362,7 +362,7 @@ def __init__(
         ref: SymbolicReference,
         flags: int,
         note: str = "",
-        old_commit: Union[Commit_ish, None] = None,
+        old_commit: Union[Old_commit_ish, None] = None,
         remote_ref_path: Optional[PathLike] = None,
     ) -> None:
         """Initialize a new instance."""
@@ -381,7 +381,7 @@ def name(self) -> str:
         return self.ref.name
 
     @property
-    def commit(self) -> Commit_ish:
+    def commit(self) -> Old_commit_ish:
         """:return: Commit of our remote ref"""
         return self.ref.commit
 
@@ -438,7 +438,7 @@ def _from_line(cls, repo: "Repo", line: str, fetch_line: str) -> "FetchInfo":
 
         # Parse operation string for more info.
         # This makes no sense for symbolic refs, but we parse it anyway.
-        old_commit: Union[Commit_ish, None] = None
+        old_commit: Union[Old_commit_ish, None] = None
         is_tag_operation = False
         if "rejected" in operation:
             flags |= cls.REJECTED
 
@@ -55,7 +55,7 @@
     TBD,
     PathLike,
     Lit_config_levels,
-    Commit_ish,
+    Old_commit_ish,
     CallableProgress,
     Tree_ish,
     assert_never,
@@ -696,7 +696,7 @@ def config_writer(self, config_level: Lit_config_levels = "repository") -> GitCo
         """
         return GitConfigParser(self._get_config_path(config_level), read_only=False, repo=self, merge_includes=False)
 
-    def commit(self, rev: Union[str, Commit_ish, None] = None) -> Commit:
+    def commit(self, rev: Union[str, Old_commit_ish, None] = None) -> Commit:
         """The :class:`~git.objects.commit.Commit` object for the specified revision.
 
         :param rev:
@@ -772,7 +772,7 @@ def iter_commits(
 
         return Commit.iter_items(self, rev, paths, **kwargs)
 
-    def merge_base(self, *rev: TBD, **kwargs: Any) -> List[Union[Commit_ish, None]]:
+    def merge_base(self, *rev: TBD, **kwargs: Any) -> List[Union[Old_commit_ish, None]]:
         R"""Find the closest common ancestor for the given revision
         (:class:`~git.objects.commit.Commit`\s, :class:`~git.refs.tag.Tag`\s,
         :class:`~git.refs.reference.Reference`\s, etc.).
@@ -797,7 +797,7 @@ def merge_base(self, *rev: TBD, **kwargs: Any) -> List[Union[Commit_ish, None]]:
             raise ValueError("Please specify at least two revs, got only %i" % len(rev))
         # END handle input
 
-        res: List[Union[Commit_ish, None]] = []
+        res: List[Union[Old_commit_ish, None]] = []
         try:
             lines = self.git.merge_base(*rev, **kwargs).splitlines()  # List[str]
         except GitCommandError as err: