Hi
Perrine !!!
Thais has a nice sound.
It is an old favourote of mine so it has 6/10 in my list. I don't know if it is used nowadays in Greece but it would be a simple, elegant, youthful name.
Thais is too similar to another name that I like more: Thalassa.
Thalassa would have 8/10 in my list.
It has a similar sound of
Thais but it is more mythologic and tied to the sea.