Jason Donovan disproves your theory I would say. Yes its a coincidence, nothing more, besides which Jim Morrison is not worthy of being mentioned in the same breath as Lennon.
John Coltrane, Johan Sebastian Bach, Joe Pass, John Mayall, John McLaughlin, Johnny Winter... i think there is something about the "J"
Wow what a coincidence! Considering a name (in enlgish at least) can only start with one of twenty-six possibilites. It is gaurenteed that at least two out of twenty seven names begin with the same letter.