Actually, I was once the casting writer for a very large group. Because there seem to be a few too many 'experts' in the casting instruction field at that time, I stole the name in humor from a real writer from years ago. It was one of his characters, I just tried to flesh him out a little. I have been fortunate though as nearly really good casting instructor has taken pity on me and tried to teach me all they know about teaching. I guess a bit of it stuck.
I have thusly picked up the nickname /appellation of 'JC' which was unintended. To that end we did lose an epescipalian priest who just could not get used calling me JC.