the girl name argument

Evan • Mother of scorpios. Polyamorous living. First responder.
Trying to find a girl name!
We have our boy name picked out, but we can't seem to decide for a girl.
I like the first name Kathryn, and the middle name Kae, but not together.
Husband like Tesla for a first name, but I don't.
Guinevere and Aria are on our list.  Favorite names are unique, not spelled weird(none of that pronounced Emily but spelled Emeleigh stuff), and a little vintage.  The hard part is our last name is Lantz, which is kind of hard to fit.