diff --git a/sphinx/domains/c/__init__.py b/sphinx/domains/c/__init__.py
index 4ce698b98..b122da164 100644
--- a/sphinx/domains/c/__init__.py
+++ b/sphinx/domains/c/__init__.py
@@ -15,7 +15,7 @@ from sphinx.domains.c._ast import (
     ASTIdentifier,
     ASTNestedName,
 )
-from sphinx.domains.c._ids import _macroKeywords, _max_id
+from sphinx.domains.c._ids import _macro_keywords, _max_id
 from sphinx.domains.c._parser import DefinitionParser
 from sphinx.domains.c._symbol import Symbol, _DuplicateSymbolError
 from sphinx.locale import _, __
@@ -948,7 +948,7 @@ def setup(app: Sphinx) -> ExtensionMetadata:
     app.add_domain(CDomain)
     app.add_config_value('c_id_attributes', [], 'env', types={list, tuple})
     app.add_config_value('c_paren_attributes', [], 'env', types={list, tuple})
-    app.add_config_value('c_extra_keywords', _macroKeywords, 'env', types={set, list})
+    app.add_config_value('c_extra_keywords', _macro_keywords, 'env', types={set, list})
     app.add_config_value(
         'c_maximum_signature_line_length', None, 'env', types={int, type(None)}
     )
diff --git a/sphinx/domains/c/_ids.py b/sphinx/domains/c/_ids.py
index c05d255c8..dcd1c93b0 100644
--- a/sphinx/domains/c/_ids.py
+++ b/sphinx/domains/c/_ids.py
@@ -31,7 +31,7 @@ _keywords = [
 ]  # fmt: skip
 # These are only keyword'y when the corresponding headers are included.
 # They are used as default value for c_extra_keywords.
-_macroKeywords = [
+_macro_keywords = [
     'alignas',
     'alignof',
     'bool',
diff --git a/sphinx/domains/cpp/_symbol.py b/sphinx/domains/cpp/_symbol.py
index cd5bb1707..87505ca67 100644
--- a/sphinx/domains/cpp/_symbol.py
+++ b/sphinx/domains/cpp/_symbol.py
@@ -163,8 +163,8 @@ class Symbol:
 
         # Remember to modify Symbol.remove if modifications to the parent change.
         self._children: list[Symbol] = []
-        self._anonChildren: list[Symbol] = []
-        # note: _children includes _anonChildren
+        self._anon_children: list[Symbol] = []
+        # note: _children includes _anon_children
         if self.parent:
             self.parent._children.append(self)
         if self.declaration:
diff --git a/sphinx/util/parallel.py b/sphinx/util/parallel.py
index 27ea0d591..03debd6ed 100644
--- a/sphinx/util/parallel.py
+++ b/sphinx/util/parallel.py
@@ -61,7 +61,7 @@ class ParallelTasks:
         # list of receiving pipe connections of running subprocesses
         self._precvs: dict[int, Any] = {}
         # list of receiving pipe connections of waiting subprocesses
-        self._precvsWaiting: dict[int, Any] = {}
+        self._precvs_waiting: dict[int, Any] = {}
         # number of working subprocesses
         self._pworking = 0
         # task number of each subprocess
@@ -94,7 +94,7 @@ class ParallelTasks:
         context: Any = multiprocessing.get_context('fork')
         proc = context.Process(target=self._process, args=(psend, task_func, arg))
         self._procs[tid] = proc
-        self._precvsWaiting[tid] = precv
+        self._precvs_waiting[tid] = precv
         try:
             self._join_one()
         except Exception:
@@ -135,8 +135,8 @@ class ParallelTasks:
                 joined_any = True
                 break
 
-        while self._precvsWaiting and self._pworking < self.nproc:
-            newtid, newprecv = self._precvsWaiting.popitem()
+        while self._precvs_waiting and self._pworking < self.nproc:
+            newtid, newprecv = self._precvs_waiting.popitem()
             self._precvs[newtid] = newprecv
             self._procs[newtid].start()
             self._pworking += 1
diff --git a/tests/test_domains/test_domain_c.py b/tests/test_domains/test_domain_c.py
index a96710791..d9f432315 100644
--- a/tests/test_domains/test_domain_c.py
+++ b/tests/test_domains/test_domain_c.py
@@ -22,7 +22,7 @@ from sphinx.addnodes import (
     desc_signature_line,
     pending_xref,
 )
-from sphinx.domains.c._ids import _id_prefix, _macroKeywords, _max_id
+from sphinx.domains.c._ids import _id_prefix, _macro_keywords, _max_id
 from sphinx.domains.c._parser import DefinitionParser
 from sphinx.domains.c._symbol import Symbol
 from sphinx.ext.intersphinx import load_mappings, validate_intersphinx_mapping
@@ -38,7 +38,7 @@ if TYPE_CHECKING:
 class Config:
     c_id_attributes = ['id_attr', 'LIGHTGBM_C_EXPORT']
     c_paren_attributes = ['paren_attr']
-    c_extra_keywords = _macroKeywords
+    c_extra_keywords = _macro_keywords
 
 
 def parse(name, string):