Jack Jack

Ever notice how so many male protagonists on TV shows (especially action/drama shows) are named Jack and are hero types?

Jack Bauer (24)
Jack Bristow (Alias)
Jack McCoy (Law and Order)
Jack Malone (Without a Trace)
Jack Shepherd (Lost)
Jack O'Neill (Stargate SG-1)

That's a lot of guys named Jack. And these are just shows I actively watch! And I've left out the non-"hero" types like the teenage Jack McAllister on "Jack and Bobby."

Did I miss anyone?