Wow, thanks for those suggestions. Out of what you gave me, I like:
Arianwen -- my only concern is that this is a bit long
NimueAderyn -- also like Aderes, which is Hebrew
RhiannonGwyneiraLowri -- I love this, but it's just my name in Welsh, so I really can't make use of it
Mairwen -- I'm back and forth on this one
SerenMegan
EvanOwen