None of my cars had a name, but when I have to start the engine on a cold morning, I always mumble to my car "don't disappoint me girl".
Why girl? I don't know, just a feeling.
Now the hammer of hell will fall on Snapzu for being a sexist, misogynist site...thanks.
My name is Sébastien (French for Sebastian), I named mine the Seb-mobile when I was a teenager.
Edit: I always cracked myself up when I wanted to go somewhere and I exclaimed : "To the Seb-mobile!!"