Cognomen Oleksiak (Oleksiak 
, Олексяк 
) , in the world, is quite a rare last name. The surname Oleksiak is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Ukraine, where it is a rare surname, and Czechia. Not in comparison with a country's population, the name is most common in Poland, the United States, and Ukraine. Likewise, Oleksiak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oleksiak | United Kingdom, Czechia, United States, Poland, France |
| Олексяк | Ukraine, Belarus, Russia |
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stanisław oleksiak PL (b. 1924) |
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michał oleksiak PL (b. 1927) |
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thierry oleksiak French association football player, FR (b. 1961) |
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| zofia oleksiak Polish Righteous Among the Nations, PL (b. 1920) |
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lea oleksiak Polish actress, PL (b. 1980) |
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| jean oleksiak French association football player, FR (b. 1935) |
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jamieson oleksiak Canadian ice hockey player (1992-), CA (b. 1992) |
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| wanda oleksiak-łowicka PL (b. 1937) |
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penny oleksiak Canadian swimmer (2000-), CA |
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| tomasz oleksiak Polish sportsperson, PL (b. 1973) |
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| witold oleksiak PL (b. 1967) |
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| paulina oleksiak Polish association football player, PL |
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| matthew d oleksiak researcher |
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| kevin oleksiak college basketball player (2005–2008) North Carolina-Greensboro |
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| daniel oleksiak (b. 1979) |
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