According to Llewellyn's Complete Book of Names by K.M. Sheard it was originally correctly pronounced as EYE-la. The AYL-sa pronunciation was established later on.
― Anonymous User 4/29/2022
2
I am named Ailsa, and even my best friend still calls me "A-el-suh". I don't have the heart to tell her she's saying it wrong.
― Anonymous User 11/11/2020
0
My name is Ailsa, and I get a lot of "Oh, like Elsa from Frozen?" I love my name, but it gets a little bit annoying. I also have a very complicated last name so I have to spell out my entire name, letter by letter, each time someone needs to spell it. I have been called: Elsa, Alisa, Alissa, Alyssa, Allison, Alisha, etc.
My Scottish nana always pronounced my name ale-za, even though everyone else used the s sound. And since she had an r-ful dialect, she actually said Ale-zur!Constant correcting of pronunciation and spelling, but I like it fine. Works for any age. I have had it from birth to 74!
Source: https://en.m.wikipedia.org/wiki/Ailsa_Craig [noted -ed]