Cognomen Kornak (Kornak 
) , in the world, is quite a rare family name. The cognomen Kornak is habitual in Estonia, where it is quite a rare surname, Poland, and Czechia, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Poland, the United States, and Germany. Also, Kornak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kornak | United States, Germany, Estonia, Poland, India |
| aleksander kornak Polish economist, PL (b. 1920) |
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| marcin kornak PL (b. 1968) |
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| uwe kornak researcher |
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| john kornak |
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