"Maybe it's a copyright thing?"
Explains your 777.
LOL. Nah, someone already owned Sully. Plus I wanted to be cool like Balrog666, Jay777, and all the other 666s and 777s
I guess we could retread our names with 111s, 222s, 888s, or an embarrassing 1-900 number (the first minute is $4.99) :)