This can also be a short form of Jeremy, as in Harper Lee's novel To Kill a Mockingbird. The main character's brother is named Jeremy Atticus Finch, but he's called Jem.
OK. First GIRLY! I like this name as a shortened GIRL name! Maybe for Gemma and spell it gem! If this is your name sorry, but gem is a jewel and it isn't very manly :o It can lead to nicknames. Sorry. Spoke the truth.
-- Anonymous User 5/21/2009
This name looks ugly and too much like the word "gem", which will lead to teasing. Maybe it would work as a nickname for Jeremy, but as a legal name it sounds silly.