I think that they all would actually make very pretty (if obscure) mns. I see
Zephyr and Thatcher as more masculine than anything, but if you'd like them on girls, I don't see why they couldn't be. Thai would be a gorgeous mn, but honestly it may seem a bit weird if the girl isn't Thai. But I guess that's not too big a deal. But of the three, Thatcher is my least favorite. It just doesn't seem name-ish at all. Anyway, here are some combos with
Zephyr and Thai. I'm just not crazy enough about Thatcher.
Zephyr CadenceZephyr ScoutCalanthe Thai
Lavender Thai (I really like this one)
Lavinia Thai