Meeting with Polish (the time where you talk to Page about her research) breaks the character name and resets it to default for the rest of the game.
Found and will be part of the first bug fix patch for this version once I'm home from work, thank you for reporting this.
I will add an option in the Extra's menu so that players that have already encountered this bug have a way to get their name back/change their name if they were affected by this (or just wanted to change their name in general)