All around the world, O'Neill (O'Neill 
, オニール 
, אוניל 
) is a very rare unisex first name. The first name O'Neill is characteristic of South Africa, where it is a very rare male name, and China, where it is an extremely rare epicene name. Much more frequently, O'Neill is the last name as well as the forename.
O'Neill is also a name for the fictitious and mythical characters: .
| sir henry o'neill, 1st bt. (1625-1671) (b. 1625) |
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maire o'neill Irish actress (1885-1952), IE (b. 1885) |
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barrett o'neill American mathematician, professor, and author (b. 1924) |
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| nial arthur ramleh o'neill (1918-1980) (b. 1918) |
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morgan o'neill Australian actor and director, AU (b. 1973) |
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| humphrey o'neill Irish Gaelic footballer (b. 1926) |
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| colman e. o'neill Irish Dominican theologian (1929-1987), IE (b. 1929) |
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riley o'neill American soccer player, CA (b. 1985) |
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| bard e. o'neill (b. 1941) |
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| ward o'neill Australian cartoonist, AU (b. 1951) |
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| redmond o'neill British activist (b. 1954) |
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| pearse o'neill Irish Gaelic football player, IE (b. 1979) |
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| parker o'neill researcher |
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| sir conn o'neill Peerage person ID=546438 |
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| conn 'buie' o'neill Peerage person ID=546446 |
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