I think it says in one of the Official guides or soemthing from someone connected with the show that his name would be Sean. Kind of like how Gilligan's first name was supposed to be Willie on Gillign's Island but they never used it. And the Skipper's real name was Jonas Grumby.
det, who remembers far too much about GI. That's Gilligan's Island Not GA as in Gillian Anderson. But notice the similarities! A connection perhaps?