Family name Olczak (Olczak 
) , worldwide, is quite a common surname. The surname Olczak is characteristic of Poland, where it is quite a common surname, Ireland, where it is a rare surname, and Sweden. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and France. More prevalently, Olczak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olczak | United Kingdom, Poland, United States, France, Germany |
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joanna olczak-ronikier Polish writer, PL (b. 1934) |
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| zygmunt olczak Polish politician, PL (b. 1916) |
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martin olczak Swedish writer, SE (b. 1973) |
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| genowefa olczak PL (b. 1913) |
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| jerzy olczak Polish archaeologist (1929-2007), PL (b. 1929) |
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| stanisław olczak Polish historian, PL (b. 1936) |
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marta olczak figure skater, PL (b. 1994) |
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| jan olczak PL (b. 1938) |
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| mariusz olczak Polish biochemist and researcher, PL (b. 1950) |
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| teresa olczak Polish biochemist, PL (b. 1950) |
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| janusz olczak PL (b. 1941) |
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| arek olczak Australian wrestler, AU (b. 1963) |
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| jacek olczak Polish businessman and CEO, PL (b. 1965) |
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| krzysztof olczak PL (b. 1956) |
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| bogumił olczak researcher |
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