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Obviously it's not set in stone or anything, but "O'Neil" is a VERY Gaelic, Irish-Protestant name with a long history (although it later spread into some Scottish families as well). At the very least, it's about 99% most likely that anyone with that last name would be of Celtic descent. Obviously, names get legally changed, passed around through marriage, things like that. But statistically speaking, a non-Caucasian with that name would be super-rare.
Stranger things have happened. I worked for a white Irish guy whose last name was Juarez. Still no idea how THAT happened.
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