Jem
in reply to a message by Eilis
This website lists Jem as a medieval form of James, but the only time I've ever seen or heard of it being used has been as a nickname for Jeremy (Like Jem Finch in "To Kill a Mockingbird," for one).
http://www.qwantz.com/index.pl?comic=629
http://www.qwantz.com/index.pl?comic=629