Could imagine becoming parents in the magical community and giving your child a (given) name and not telling them they need a chosen name until they’re about 18? You could literally control them…
Parent: Can you go to the shops son?
Son: No mum i’m playing video games!
Parent: GERALD! GO TO THE SHOP AND SKIP ALL THE WAY THERE FOR BEING RUDE!
Son: *goes to shop* *skips*
Parent: I’ll tell him next year ;)