I've seen Deio before and think it's interesting. Googling it says it's a nickname for
David? Would it be pronounced DAY-o?
And ooh, an Awen! Is Awen typically used for girls? Somewhere I read that Awen was masculine and Awena was the feminine form. Neat meaning, though.
I also like
Mererid,
Haf,
Llinos, Gwion,
Wyn,
Bethan,
Eifion, Anest,
Mair, and
Bryn. Lots of good stuff.