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..It depends on what their name is. Example) Jason: Jay.
Jason Williams Jason Williams
Dizzy is the nickname of Jason Neil Gillespie, the Australian cricketer.
If you like 'Nan' as a nickname, then yes, it is a good nickname.
A good nickname for what? Sounds a bit pansy
A good nickname for Christian would have to be Chris.
It does not require a nickname.
Jaz might be a good nickname