License plates are a good one. It depends on how you fix it up. If it is a Mazdaspeed3 your plates can say NOW or WATCH1 If a plain 3 perhaps Sweetie or Grace on the plates.
I hope this helps. Best.
Honestly it is all up to you, decide something you like and that has value to yourself, naming your car is a choice an doesn't mean anything besides that. I named my car Sally just because I get kicks and giggles from my friends when I tell them to watch out for "Sally" lol. I would just keep it simple and call it Snow or Blanca (means white in Spanish with a female ending).
Or Blanco if you vehicle is a male in your mind.