Well it was always Bob but I still thought of my initials as RLC (R for Robert) even though nobody ever calls me Robert, unless it's like a state trooper looking at my license when I get pulled over for speeding or something like that. Plus I'm a big fan of 'jazzing it up' and it was just so exciting to change from 'RLC' to 'BobC'.
If you want to change your name to Borfopolis Corvette then you'd have to change your screen name to BorC so that wouldn't conflict!