My Ninety is called "Mortimer" - for no better reason other than a bloke at work started calling him that and it stuck.
My Series 2 is called "Pod" - from his number plate.
The name for mine is 'Beauty' but I usually refer to her by the shortened version of 'Bastard Motherf****n piece of fuc***g s**t' ... which is, I must add, a term of endearment!