I'm not a fan of either name to be honest.
Genevieve is ok I guess, but I don't adore it.
I think they do not compliment each other in sound. They blend together. Cheyennegenevieve. And something about those two names in such close proximity does not please my eye. I come up with combos like that all the time - two names I love, but together, just not working.
Yay christmas baby