Actually, my first thought was Montag (MON-tahg) from Ray Bradbury's Fahrenheit 451. It took me a minute to realize that Montague was actually in Romeo and Juliet.
It has a romantic charm and it's not as obvious as Romeo, but it's still kind of out-there. Though I admit, I *would* get a kick out of seeing a sibset with a boy name Montague and a girl named Capulet. :)