Well, yes. 'Kelly' is also a name of Irish origin (as in Ned Kelly, famous IRL Australian outlaw).
In fact about 95% of white Australians are descended from the English, Irish and Scottish (these days, anyway- back in the 50's-60's you just about couldn't find a white Aussie who wasn't descended from there)
I'm Australian, my last name is Chrisp. It's Scottish.