MtheGM, I knew this thread had to have been started by you!LOL!

Ebbie, my dad always said "Rye-oh" even though he knew it was supposed to be "ree - oh" though I suspect that may have been later after he'd grown up. Not sure though as his paternal granddad knew many Native American languages some of which he taught my dad before he died, so surely he knew some Spanish, too. But, he died when dad was young, so he didn't remember any of the NA languages.

...anglophones who pronounce Caitlin as if it were Kate-Lynn?

That's the only way I've heard it pronounced in the States. I know it's not correct, but I don't think the people who are naming their daughters care which is a pity, imo.

I've mentioned before, Belle Fourchette, WY which the residents pronounce bel-FOOSH; you'd be "puttin' on airs" to pronounce it correctly.