Nicknames given by siblings that have "stuck" ...

[Tillyscoutsmum]

DH is nearly 40 and is still called Luli (loo-lee) by his parents and siblings. His slightly older brother couldn't pronounce Ewen as a small child and his mispronunciation has stuck.

DS is just starting to talk and calls DD "Titty". I'm hoping its a temporary thing !

My younger brothers are twins. One has often referred to the other as "the afterbirth"
He also has stickyout ears so was nicknamed wingnut. This has stuck so much with his mates that he has it tatooed on his arm!

Our Daisy has been re-named Dotty by her older brother and it's stuck.... It totally suits her though!

Dd 1 got re-named Cookie by her sister as she couldn't pronounce her real (vvv unusual) name. It suits her and it's stuck.