I have always liked
Rhea... and I honestly pronounce it rhay most of the time... but would consider raya as well.
Rheia is a case of unnecessary vowels to me. I grew up with an excess of vowels in all my names, and I was never a fan of correcting the spelling for everyone. It's a pretty name, for someone else to consider.
I, myself, would go with
Rhea in a heartbeat though.
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"How wonderful it is that no one need wait a single moment before starting to improve upon the world." -Ann FrankMama to my "bright star"
Clarisse Bituin and Wife to
Julius.
Mahal na mahal from our little family to yours!