Last name Szostak (Szostak 
, Шостак 
, Shostak 
) , throughout the world, is a common surname. The cognomen Szostak is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, and Poland. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Ukraine, Poland, and Russia. Also, Szostak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Szostak | Germany, Paraguay, Canada, United States, Poland |
| Шостак | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |
| Shostak | Germany, Canada, United States, Poland, Brazil |
| Schostak | Germany, Canada, United Kingdom, United States, Brazil |
| mikołaj szostak Roman Catholic bishop (b. 1710) |
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józef szostak Polish officer, PL (b. 1897) |
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stanisław szostak Officer of th Polish Army, GB (b. 1898) |
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karol gąsienica szostak Polish sportsperson (1908-1996), PL (b. 1908) |
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| zygmunt szostak Polish Righteous Among the Nations, PL (b. 1886) |
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| ludwika szostak Polish Righteous Among the Nations, PL (b. 1891) |
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jack william szostak American biologist, US (b. 1952) |
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| bronisław szostak PL (b. 1894) |
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| edward szostak Polish basketball player, PL (b. 1911) |
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| zbigniew szostak Polish officer (1915-1944), PL (b. 1915) |
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| jan szostak PL (b. 1913) |
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karolina szostak Polish journalist, PL (b. 1975) |
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stephanie szostak French actress, FR (b. 1975) |
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| jan szostak PL (b. 1917) |
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| zdzisław szostak Polish composer, PL (b. 1930) |
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