I wouldn't overthink the country of original or cultural significance of him being called 'Patty'. It has nothing to do with the Irish or any of that, Aussies just generally give everyone a nickname. Matthew - Matty, Robert - Robbo, David - Dave-o, Patrick - Patty, Aron - Az. It's just what we do...

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The Irish would not shorten Patrick to Patty. Patty is short for Patricia. Paddy is short for Patrick and comes from Padraig, a variant of Patrick. (Ex. It's St. Paddy's Day, not St. Patty's Day)


