Inga -I believe this is Scandinavian and means protected by Ing, which is possibly the God of fertility, but I could be mixing up info.
Demarys or Demaris *Greek-demm-air-iss, Variant versions of Demetria or Demeter, meaning "fruitful increase" and "Lover of the earth"
Emberley -I normally spell it with an Ey not just Y b/c I love the connection to Ed Emberley, childrens drawing books illustrator. That is how his surname is spelled, although looking it up elsewhere, I always see just the Y ending. Ember variant, wood connection.
Ivory -used to be a boys name, especially in the Cote D'viore, the western coast of Africa, also known in English as the Ivory Coast.
Oleander -sounds like an awesome surname to me-
Lynx -I saw a mountain lion in my backyard once, and even though a ml and lynx are two different wild felines, I love the sound of this for a middle or second middle name despite the fact it is hard to make a smooth-flowing combo.
Quartz--I've owned many crystals, and clear quartz is my favorite stone. I like the combo Elisabeth Quartz.
Aqua-this one is growing on me, and my bedroom walls are aqua, it seems like a strong, feminine, and gentle name with a new-age-like vibe.
I don't know what you consider "legitimate" but these are definitely obscure:
Arlise / Arlyss
Gwyneira / Eira
Cairdeas (synonym for my name in Irish so it's perfect for us...as a middle)
Joule (middle only)
These feel stylish yet are uncommon:
Catalina or Catalene