I usually dont rename characters, but thankfully I have a good first and last name to use for rpg characters when I do.
As for names I regret, I did a playthrough of 7 with all the characters named after genitals. Im not sure I remember all the names but Cloud was Clit, Tifa was Tits, I think Aerith was Anus, Barrett Ballsack, and I have no idea what the other names were.


Oh, and once I named my pokemon rival after my friend. I kinda felt bad constantly beating up all his pokemon...