Im going to agree Cianna Leona sounds like the country Sierra Leone, and Kerrigan Leona doesn't seem to flow, Jaelyn works nicely, but is awfully similar to Jaeden/Jaden and all names similar in that area, which have become overly popular. I like the name Raven, except that the girl I knew who changed her name to Raven at 19, was called Ravey for short, and that sounds a lot like Rabies... which can't be good. I also like the name Rave. Aubrey Leona doesn't seem to flow all to well, and Laken Leona, to many l's...
I think Foehre Leona sounds nice. What do you think? or Fien, mind you as far as unisex names go that one comes off masculine to me.
Gaerl Leona, I like this one too.
Or if you really like the name Cianna, you could always play with it, to get something that sounds less like 'Sierra', my tired mind came up with Cianda.
Cianda Leona, flows smoooothly :)
I hope you find something you like, best of luck :)