Family name Kupczak (Kupczak 
) , around the globe, is quite a rare last name. The surname Kupczak is habitual in Poland, where it is quite a rare surname, Ireland, where it is a rare surname, and Czechia. Measured by absolute frequency, it is the most numerous in Poland, Germany, and the United States. More frequently, Kupczak is the forename as well as the last name.
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| Kupczak | Germany, United States, Poland, France, Brazil |
| marianna kupczak PL (b. 1861) |
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| roman kupczak PL (b. 1894) |
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| józef kupczak (b. 1917) |
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| janusz kupczak Polish political scientist, PL (b. 1938) |
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szczepan kupczak Polish Nordic combined skier, PL (b. 1992) |
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| ryszard kupczak PL (b. 1944) |
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| wiesław kupczak PL (b. 1961) |
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| jarosław kupczak PL (b. 1964) |
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| sławomir kupczak Polish composer (1979-), PL (b. 1979) |
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| maria kupczak researcher |
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| arkadiusz kupczak researcher |
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| piotr kupczak (b. 1975) |
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| marek kupczak CZ (b. 1978) |
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| mateusz kupczak Polish association football player, PL (b. 1992) |
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