What is Jean Claude's last name?

as far as কামান is conserned he is never প্রদত্ত one. and historically he would have probably been indentified দ্বারা either his trade অথবা the town he came from, and since we know niether of those we can't even guess at what it is.

Truthfully, we don't know much about his life as a human.

He was the whipping boy to a noble's son.
He knew his mother though never mentioned a father.
He had a younger sister.
He was a "wanton thing".

That's pretty much it.