I like
Maeva, and it could definitely grow on me more. In my head I say MAY-vah, but mah-EH-vah and MAY-ah-vah are lovely as well. I'd be very happy to meet a little girl named
Maeva.
Manon is rather ugly and masculine sounding to me, at least in English. Man on. Also, it bothers me that it's a nickname.
Eos is interesting. I really don't think it would work as a first name but it could be nice as a middle name.