I actually know a real life
Mars (chosen name). There's also the singer
Mars Argo. There's also
Bruno Mars.
Mars is a lot less weird on a real human than a lot of the other planet names imo.
I also ironically like
Jupiter for a girl, it's on my GP list.
Venus reminds me of
Venus Williams, and it is a nice name.
Neptune reminds me of the fish god exclusively. I'm so drawn to
Saturn for its dark aura but it's way too intimidating for real life usage. I also find it a sad name.
Semi-off topic, but I also knew a
Lars.