There will inevitably be some who will try to say it as "khaki", and that will just lead to "Tacky Khaki". Believe it! Oh, and I think some playground genius will try to associate it with "cacky" which is a proto-slang word in the US meaning "distasteful"! "Tacky cacky khaki Kacie!" argh! Having a "k" and a "c" together like this in a name is way more "risky", in terms of bullying potential, than the "c" and "s" of the original, Casey.
Believe it or not parents, "Casey" (which was once a male-only name) is not the only name out there; there are thousands of lovely names out in the world and for whatever reasons this illiterate and undignified name appears on every sixth girl in kindergarten.
This spelling is so cutesy. That it actually looks like a nickname, not a name. Besides, Casey is actually one of my favorite *boy's* names, so I would never consider using a variant for a girl's name in the first place.