I hate the name
Casey/
Kasey for a boy or a girl, it's really bad IMO. I think I've known maybe 3 girl Caseys and one boy. But I really like
Kailey/
Kayleigh, it's sweet but different, unlike
Casey which I find drab and ugly (sorry but that's what I always think when I hear it). So, of course, I'd choose
Kailey. I've only known one
Kaylee I think, and I'm pretty sure she spelled it
Kaylee. Sorry if that was kind of harsh, I was just trying to get my opinion across.