Cognomen Korczak (Korczak 
, Корчак 
, קורצ'אק 
) , in the entire world, is quite a common last name. The cognomen Korczak is characteristic of Eastern Europe, particularly Poland, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Russia. Also, Korczak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Korczak | Germany, France, Canada, United States, Poland |
| Корчак | Kazakhstan, Ukraine, Kyrgyzstan, Belarus, Russia |
| קורצ'אק | Israel |
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janusz korczak Polish educator (1878-1942), PL (b. 1878) |
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stanisław korczak Polish policeman murdered in Katyn, PL (b. 1896) |
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józef korczak PL (b. 1891) |
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marian korczak LT (b. 1897) |
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korczak ziolkowski Polish American designer and sculptor, US (b. 1908) |
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rozka korczak Polish Jewish partisan leader during World War II, PL (b. 1921) |
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| adolf korczak (b. 1892) |
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| franciszek korczak Polish Righteous Among the Nations, PL (b. 1902) |
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| andrzej korczak PL (b. 1896) |
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piotr korczak PL (b. 1961) |
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| jerzy korczak Polish writer, PL (b. 1927) |
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| marian korczak Polish politician and deputy, PL (b. 1930) |
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| mieczysław korczak (b. 1921) |
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| mieczysław korczak PL (b. 1924) |
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marcin grzegorz korczak PL (b. 1978) |
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