Here's a solution.
You can access an "edit names" menu with a transparent button in the top right corner of the game (hover your mouse over there to see the button).
Changes are persistent so it will apply to all of your saves and replays (as long as the mod is installed).
It won't break your saves (no original files are modified). If you remove the mod (by deleting
bibifoc folder) or play the next version without this mod, the game will just return to original names.
This mod will very probably be compatible with later versions of JOHN.
You can edit any names in the game. For now, I just add
Conner to the list. If you want to add more, add names to the list at the beginning of the
edit_names.rpy file.
!!! It's possible names aren't correctly replaced in some situations. Please let me know if this is the case. !!!
Install: Unzip
edit_names.2.zip in
<JOHN folder>/game folder.