How do you pronounce it?
I thought there was only the one way. The best I can write is eyes-uk. I've not known anyone say it any differently but a recently name baby has made me wonder.
A colleague (not the mum) says eye-ZAK.
Which to me is a bit like Dorian, usually pronounced door-ee-un being pronounced dorry-an.
Not utterly wrong but not exactly right either.