Cognomen Wilczak (Wilczak 
) , all over the world, is quite a rare surname. The cognomen Wilczak is characteristic of Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and the United States. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Brazil. Likewise, Wilczak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Wilczak | Germany, France, Brazil, Poland, United States |
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jan wilczak Major of the Polish Army, PL (b. 1898) |
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paweł wilczak Polish actor, PL (b. 1965) |
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| tadeusz wilczak PL (b. 1908) |
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| bronisław wilczak Polish colonel, diplomat (1928-1999), PL (b. 1928) |
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| dariusz wilczak Polish journalist, PL (b. 1961) |
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| tomasz wilczak PL (b. 1955) |
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| becky wilczak American luger, US (b. 1980) |
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| jacek wilczak researcher |
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| maciej wilczak researcher |
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| waldemar wilczak researcher |
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| cynthia a wilczak researcher ORCID ID = 0000-0003-3224-255X |
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| kacper wilczak Polish sportsperson, PL (b. 1991) |
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| daniel wilczak Polish mathematician, PL |
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