Family name O'Neill (O'Neill 
, オニール 
, אוניל 
) , all around the world, is a common surname. The family name O'Neill is habitual in Ireland, where it is a common surname, Jersey, and British Virgin Islands, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, the name is most common in Ireland, the United States, and the United Kingdom.
| niall culanach o'neill King of Tyrone (b. 1235) |
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| matthew o'neill, 1st baron dungannon Irish peer, GB (b. 1520) |
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| shane o'neill Irish chieftain, GB (b. 1530) |
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| con macshane o'neill Irish noble (b. 1565) |
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| hugh mcshane o'neill Irish chieftain (b. 1575) |
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| rosa o'neill Peerage person ID=544241 (b. 1580) |
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| shane o'neill Irish noble (b. 1599) |
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| art óg o'neill (1600-1677) (b. 1600) |
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| conn o'neill (1601-1622) (b. 1601) |
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| brian o'neill (1604-1617) (b. 1604) |
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| hugh dubh o'neill Irish soldier (b. 1611) |
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| daniel o'neill English politician (1612-1664), GB (b. 1612) |
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arturo o'neill Governor of West Florida and Governor of Yucatán, MX (b. 1736) |
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| felix o'neill (died 1796) (b. 1720) |
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| arturo o'neill, 1st marqués del norte (1736-1814) (b. 1736) |
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