He’s a stunted 8 year old who associates X with edginess. X factor. X Men. X Ray. X rated films. XXX. All super fucking cool
He originally wanted “Model 3” to be called “Model E” so that the three (at the time) Tesla models could spell out “SEX”. Fortunately that name was already taken. He’s a petulant child.
Also, he’s an unoriginal dipshit. All he’s good at is buying things and slapping his name on 'em, he’s never had an idea of his own.