A good nickname for someone named Christian could be "Chris" or "Cris" for short.
A good softball nickname for a girl named Emmalee: Emma; Lee; Em
A good nickname for someone named Charity could be Char or Cherry.
Coco
CalCallyCabLebLeby
It's possible that Justin Bieber knows a girl named Emma. It's hard to know who he knows. He does know a lot of people, though, so he probably does know someone named Emma.
Only if that is your nickname for having a chode.
Matt is the nickname for someone named Matthew.
Chouchou
pea (vegetable) or nickname for someone named Cesar
Joe-Joe!:) That's what I call my friend Jordan:)
Kee(pronounced Key) or K, or keg.