Surname Niall (Niall 
, نايل 
, 尼尔 
, along with others...) , around the world, is a common last name. The surname Niall is habitual in Sudan, where it is quite a rare surname, Egypt, and Ireland. Measured by absolute frequency, this name is the most popular in Egypt, Sudan, and Saudi Arabia. More frequently, Niall is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Niall | United Kingdom, Ireland, Australia, United Arab Emirates, United States |
| نايل | Jordan, Iraq, Egypt, Sudan, Saudi Arabia |
| 尼尔, 尼爾 | China |
| نيال | Syria, Palestinian Territory, Turkey, Iraq, Sudan |
| ニール | Japan |
| Ниалл | Russia |
| niall, earl of carrick Scottish earl, GB (b. 1250) |
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| james mansfield niall (1860-1941) pastoralist and businessman (b. 1860) |
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| kenneth mansfield niall (1883-1953) grazier and company director (b. 1883) |
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| ruth ida niall 19 Apr 1885 Kansas - (b. 1885) |
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| jake niall Australian journalist, AU (b. 1901) |
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| ian niall Scottish writer (b. 1916) |
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| john francis niall b.22 June 1928 d.26 December 2018 (b. 1928) |
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| brenda niall Australian writer, AU (b. 1930) |
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| phillip john niall (born 1955) (b. 1955) |
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| geoffrey todd niall (born 1957) (b. 1957) |
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| catherine ellen niall (born 1962) (b. 1962) |
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| k. m. niall Peerage person ID=570986 |
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| horace lionel richard niall Peerage person ID=627072 |
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| keith niall researcher ORCID ID = 0000-0003-4858-2962 |
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| james mansfield niall Peerage person ID=570987 |
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King, Bradley, Brennan, Kennedy, Doherty, Johnson, Higgins, Farrell, O'Brien, O'Neill, Mccarthy, Sullivan, Anderson, Campbell, Connolly, Robinson, Donnelly, O'Connor, Williams, Gallagher, Cunningham, Fitzgerald, Collins, Carroll, Mckenna, Hughes, Daly, Ward, Moran, Smith, Brady, Brown, Burke, Byrne, Kelly, Dunne, O'Sullivan, Duffy, Jones, Horan, Flynn, Walsh, Quinn, Martin, Murray, Murphy, Clarke, Rooney, Lynch, and Fitzpatrick