I remember that there's another file which deals with a lot of ingame names, including your character's name in game (just to help in case someone remembers it) which was not a text file. The only thing I remember about it was that it required a hex-editor to make changes to, so if someone remembers the specific file, it could be worth deleting and revalidating through Steam.
Alternatively, just delete local files on Steam and reinstall. A bit of a pain, but it will resolve it for sure.