I clicked on this knowing people would immediately think about the car. But in my personal opinion it is a really pretty name. That may just be me though.
Porsche is really a bad name for a girl. I first thought it would be a name for a boy. Anyway I think every German would laugh about this name because in Germany Porsche is a family name (and yes, of course, the name of a luxurious car).
Car names are always used by people who could never afford them anyway. It's very tacky. So, I wouldn't say that the kid was clearly named after the place she was conceived in, as there's no way such people had a Porsche, or got a ride in one.