What would an Irish person say as an exclamation of surprise? I need something polite enough that an adult would use it when addressing a young child (if, for example, the adult is meeting a child he knows but hasn't seen in a while, and is surprised at just how much the child has grown). I'm also trying to avoid any variations of 'my god'. I looked online, and one source said the word 'janey' was used. Is that an actual thing? It doesn't need to be hugely stunned surprise, just a sort of mild shock of the unexpected which they quickly move on from.
Edit: Thanks again, all. Haha, looks like that was a bit of a tough one. Then again, I have a hard time thinking of many American exclamations that fit the criteria I gave, though there are a few.