Yeah, the MC's name is set to a persistent data variable, so if you rename yourself on Day 1 it'll affect all saves.
There also should be a rename MC on the main menu. If that's there, it'll do the same thing that going through Day 1 does.
Well hopefully you can fix whatever is causing the name being forgotten like this in the first place so I only need to do that if I actually want to replace the name.
