The Annals of Anne

> You need to slay your evil Auntie, who also knows of these name powers.

This'll do.

If we go with this, then Anne should be unable to change her last name to anything that would start with "anti-." Otherwise she could change her name to anything Auntie could, plus a ton of other names. It wouldn't be a fair fight.

but isn't that why Auntie is opposing her? Anne is the child so of course she would inherit the ability to change her name for more possibilities, to the point that her child will simply be named "A".