Nuni My Name Is Jeff I Need Help Finding A Nickname Can Anyone Help?

I need help finding a nickname can anyone help? - nuni my name is jeff

OK, for my cousin who needs a nickname cuz me and my friends, and it is a kind of

Will I stay with the girls' names such as Nick
-Princess
Nuni --
-Blondie
Model --

and boys are almost as
Slim
Casper --

so that nobody can think of a name cool nickname?