I was one of the many clueless who pronounced Siobhan like See-Oh-Bon. I still say it that way in my head even though I know it's wrong! Shiv-awn is going to take time to get used to.
I also pronouned Aro like "arrow." To answer the Brit who thought Arrow is normally pronounced like Aro anyway, here in America we don't. We pronounce "Arrow" like we do "Air", not "Ar" like a pirate.
I've been saying Arrow in my head so much as well, this will take time to get used to Arrrro. Hah. Now I keep picturing Aro as a pirate. A bloodsucking, red-eyed pirate. What a scary sight. Far cry from good ol' Jack Sparrow, that's for sure
Getting a little off topic now, just wanted to comment that yet another person was clueless about some of the names in SM's books. Though I'm proud to say I DID
know how to pronounce Carlise, Esme, and Rosalie's names. I'm proud of that fact, at least. Heh.