I can think of three named cars I’ve known.
When I was a kid, my sister drove a beater Plymouth Valiant. She called it Bertha the Pig, or just Bertha, for some reason.
When Wife and I refer to her car, we’re too lazy to say “the Prius”. That’s 3 syllables; leaves you tongue-tired. We just call it Pip, short for plug-in Prius.
I have a VW Golf. It’s boring white, quiet, kinda dorky looking. It also has a 350 horsepower engine, and other high performance features and modifications. We call it Clark, after the dorky Daily Planet reporter.