I can't get on board with
RILEY on a girl either.
Riley makes me think of a Rottweiler.
I don't really like the name on a girl with any spelling, but
Rylee is probably the nicest of the possibilities IMO. I think the -eigh doesn't fly well - it looks too surname-inspired and pretentious, and not all that feminine.
Rylie is okay but too much like
Kylie with an R.
Reilly might also be nicer on a girl than
Riley.
- mirfak