Jacques
James
Jasper
Jeremiah/Jeremy
John (and, I like Jack as a nickname)
Jonathan
Joseph
Julian

My son's name is Jake, you could also spell it Jayke for something different (I'm kicking myself I didn't think of that before he was born, I think it's a really cool way to spell it!)
Don't kick yourself, telling everyone "it's JAYKE with a Y, no not Jake, but it's pronounced the same" and correcting everyone who spells it wrong on papers would get old after about five minutes. Believe me, I have a common name with an uncommon spelling, so I know what that's like.