This site doesn't list the name's meaning, only this:
http://www.behindthename.com/name/luana
However, this name was very popular in Italy (not so much anymore, seems to be middle-aged/older there) and Portugal.
So I think it must have an Italian or Portuguese origin as well?
Luan apparently means "moon" in Portuguese, is
Luana related to this?
I'm interested in finding out the origin of this name.