I say
Erin Air-en as you do, but the A sound in
Aaron and in
Harry is far flatter, like the A sound in "cat". Therefore in my accent
Harry is not identical to "hairy".
Southerners do say AY-unn, but that's not identical to
Ian, which Southerners would say with an initial EEE sound rather than the "AY" at the beginning of
Ann. To be honest, I've never actually heard anyone say
Ann so that's it identical to
Ian or vice versa. I read that it occurs in "
Made in
America: An Informal History of the English Language in the United States" by
Bill Bryson. I am certain he said it occurs in the Midwest, and maybe he specified Michigan? That book was so interesting, I should get another copy and read it again.