It is very rare but I've heard some people from Great Britain pronouncing it like that for some reason.
- He said "However" pronouncing it as "Hoyiever".
- He said "Let him down" pronouncing it "Let him doyn".
- He said "He freaked out" pronouncing "He freaked oyit".
It's quite strange although they have numerous things in their accent!
(You may ask where I heard that one, it's from Jim Browning if you are familiar with him.)
Which dialects pronounce it this way? And what is this called?