as with all names, depends on the person pronouncing it I love Carys and have to say, if I'd never heard it, I would've pronounced it Cariss
Yes and within Wales there are quite different accents so could sound different depending on where in Wales are from, all my family are from South Wales so all have the same sort of accent.

Interesting on the Carys pronunciations... I think I would pronounce it Car-iss or Care-iss but the confusion of how to pronounce/spell the name puts me off a little. I do like it though for its unusual-ness!
If I had realized the pronunciation issues I wouldn't have picked it, people not being able to spell it doesn't bother me, but the pronunciation isn't something I would have expected, or I thought that once people had heard it they would know how to say it, but it seems not.