iCloud nickname

Weird one.

I noticed a while ago that the name iCloud knows me as is not my name but "sugar daddy"

Lol. I know.

I am not sure if someone played a prank on me a while ago or what, but sometimes when I see an email addressed to me in iCloud, my name will show up as "sugar daddy" in the receiver list.

Recently I reset my AirPods Pro and they are now also called "sugar daddy's AirPods Pro."

Question - where do I fix that?

I have tried in Apple Music/iTunes but there my nickname is just listed as my name.