Cognomen O'Neal (O'Neal 
, オニール 
, אוניל 
) , globally, is quite a common family name. The family name O'Neal is habitual in British Virgin Islands, where it is quite a common surname, Barbados, and Malta, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in the United States, Canada, and Australia. Very seldom, O'Neal is the forename as well as the last name.
| jeffrey hamet o'neal portrait painter (1734-1801), GB (b. 1734) |
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rose o'neal greenhow American spy, US (b. 1814) |
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edward a. o'neal Confederate Army general and 26th governor of Alabama (1818–1890), US (b. 1818) |
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john o'neal United States Navy Medal of Honor recipient, IE (b. 1841) |
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emmet o'neal American politician (1853-1922), US (b. 1853) |
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mary thomas o'neal American labor activist (b. 1887) |
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anne o'neal actor (1893-1971), US (b. 1893) |
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zelma o'neal American actress (1903-1989), US (b. 1903) |
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frederick o'neal American actor (1905-1992), US (b. 1905) |
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| william r. o'neal American lawyer and businessman, US (b. 1864) |
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patrick o'neal American actor (1927-1994), US (b. 1927) |
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| charles duncan o'neal Barbadian politician, BB (b. 1879) |
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| joseph t. o'neal American mayor (1881-1944), US (b. 1881) |
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| margaret o'neal American mother (b. 1884) |
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dick o'neal American basketball player (1935 – 2013), US (b. 1935) |
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