Surname Olszak (Olszak 
) , in the world, is quite a rare cognomen. The family name Olszak is characteristic of Poland, where it is quite a rare surname, Ireland, 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 Germany. More frequently, Olszak is the forename as well as the last name.
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| Olszak | Germany, France, United States, Poland, Argentina |
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wacław olszak Polish physician, CZ (b. 1868) |
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| heinrich olszak AT (b. 1887) |
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| wacław olszak Polish engineer, PL (b. 1902) |
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henryk olszak Polish speedway rider, PL (b. 1957) |
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celina olszak Polish economist, PL (b. 1958) |
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| feliks olszak PL (b. 1904) |
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| wiesław olszak Polish engineer (1925-2018), PL (b. 1925) |
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wojtek olszak PL (b. 1976) |
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| jerzy olszak politician (b. 1941) |
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| zbigniew olszak Ph.D. Politechnika Wrocławska 1978 (b. 1946) |
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| norbert olszak French legal historian (b. 1950) |
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| anne olszak French politician, FR (b. 1971) |
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| grzegorz olszak PL (b. 1969) |
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| paweł olszak (b. 1970) |
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| tomasz olszak researcher ORCID ID = 0000-0001-8631-8084 |
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