Name the Hero Contest

I've been mulling over a new book idea for a few months now. I really like the idea, and one day I hope it will make its way onto the page. But I have a bit of a problem with one of the heroes. He doesn't have a first name.
He was originally Robert, and in my notes he's "Robert (need a new name for him)". I've got another hero in another book idea who has decided he's Robert, or Rob as he prefers. Since I can't have guys with the same name in different books, this dude needs a new name. I...