Why Bob you ask? The question is, why not Bob?
There is an entire series dedicated to a character named Bob, or a skull sidekick named Bob. Robert Baratheon the fictional character in the A Song of Ice author George R. R. Martin was probably never called Bob, but definitely could have been. Then we have Bobby Pendragon the titular character from the series of the same name, and lastly we have The Dread Pirate Roberts, terror of the seas from Princess Bride.