If it's Irish, it's probably pronounced "John Smith". Irish pronunciation just doesn't track the written word at all.
Nah, you're just reading it wrong...
only joshing, know what you mean. It doesn't track the English pronunciation of those letters/combinations. Then, most other languages don't, being different languages!
(I'm Irish, as in from Ireland not American/Canadian/Timbucktoo-an Irish, so I could pronounce and read it just fine - just didn't know what the hell it meant!