Congrats, Kimberlie!! A sweet little boy - bet you can hardly wait!
As for names, I'm pretty old fashioned and like standard names that, when shortened, are just as nice (Matthew/Matt, Alexander/Alex, Benjamin/Ben). I like Sam, too (but not Samuel). I LOVE the name Dylan because Dylan Thomas is one of my favourite poets and I'm partial to Ethan, also.
Choosing a name is such a personal thing, but if I may, I'll suggest that if you decide to call him Jack and then later have a girl, DON'T call her Jill (I've lived that personal ****!)