Yeah its a trait that I got from my family, in particular my Mum. All my previous cars came named. The unreliable Mistubishi station wagon was known as 'bitch', quite a surprise considering we sold that car by the time I was 8. Mum's old car, the toyota camry, is known as Susy.
My first car, a poo brown 81' Honda Civic was known as Peanut (short for peanut brownie) and my current vehicle, my piaggio zip scooter is known as Ziggy.