To avoid confusion between the different names of parent classes and child classes, I decided to change the name of the parent class to something more suitable. When I commit this change, should the commit message on git start with "Refactor ..."?
Yes, renaming is considered an act of refactoring according to many people, including Martin Fowler, author of the book Refactoring.
For example:
From Refactoring source code in Visual Studio Code:
Renaming is a common operation related to refactoring source code
From Rename refactorings | IntelliJ IDEA Documentation:
Renaming local variables or private methods can be done easily inline since only the limited scope is affected. Renaming classes or public methods could potentially impact a lot of files. Preview potential changes before you refactor.