Cognomen O'Neall (O'Neall 
) , all over the world, is a very rare family name. The last name O'Neall is characteristic of Slovenia, where it is a rare surname, Australia, where it is a very rare surname, and the United States. Very seldom, O'Neall is the forename as well as the last name.
| VARIANT | COUNTRY |
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| O'Neall | Slovenia, Spain, United States, Australia |
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john belton o'neall American judge, US (b. 1793) |
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| abijah o'neall Farmer and Quaker of Warren County, Indiana, US (b. 1762) |
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john h. o'neall American politician (1838-1907), US (b. 1838) |
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| abijah o'neall, jr. Indiana legislator, US (b. 1798) |
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| rhoda o'neall Quaker woman from Indiana (1800-1841) (b. 1800) |
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charles f. o'neall American mayor, US (b. 1875) |
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| chuck o'neall college basketball player (1978–1979) Houston |
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Siv, Erin, Mindy, Sarah, Shawn, Stacy, Alara, Chris, Cindy, Barry, Brian, Bryan, Karen, Katie, Kelli, Kevin, Peter, Peggy, Randy, Robin, Debra, Danna, Judy, David, Joan, Lynn, Sue, Amy, Dan, Don, Liz, Jon, Jim, Emi, Mike, Sean, Andi, Cris, Bill, Kate, Kyle, Rene, Rick, Ruth, Ryan, Dawn, Gene, John, and Damon