People in his time didn't have nicknames. It would have been considered rude to address a person to address a person in that way. People were more formal.
his nickname is jay jay
Jay Jay
jay weezy
Jake
jay
Jigga
Jigga
Jay or jay jay that's all I can think of
John Jay has written: 'John Jay: the making of a revolutionary'
John Jay
Doctor Jay
Janie Jay