1. I start a day and save my game (Save A).
2. I enter Rania's Fun House and open the blue chest, she renames everyone. I keep saving once in a while (Save B)
3. I defeat Rania, get my names back and go back to camp. I save the game, overrwritng the Save B.
4. I load Save A, open the blue chest and now Eric(a)'s name is changed to Cockbreath in all my saves, including those made long before finding out about Rania's Fun House (e.g. before stealing panties in the Medical Exam event) and those made after defeating Rania (Save B). Fortunately, defeating Rania again will undo this.
You can say it makes sense becuase of Rania's reality bending powers, and that it's not really a big deal, as people rarely load an old save just to check something in a dungeon they've already cleared. Either way, it was still quite annoying to me.