Why do so many American heroes begin with "J"?

Have you ever noticed how many male American movie heroes have names beginning with the letter "J"?
  • Jack Bauer
  • Jack Ryan
  • Jack Reacher
  • Jack Harper (Tom Cruise's character in the trailer that got this post started)
  • Jack Slater
  • John McClane
  • John Kruger
  • John Kimble
  • John Matrix
  • John Connor
  • John Rambo
  • John Spartan
  • Judge Joseph Dredd (does that count as two?)
  • James Bond (English character, American movies)
I'm sure the list could go on.

Is there some sort of rule I am not aware of?  To me this seems to imply that not every Tom, Dick and Harry can save the day - it's up to John, Jack, Joe and James.  
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