Surname Kwaśny (Kwasny 
, Kwaśny 
) , in all the world, is quite a rare last name. The family name Kwaśny is habitual in Poland, where it is quite a rare surname, Germany, where it is a rare surname, and Slovakia. Not in comparison with a country's population, it most frequently occurs in Poland, Germany, and the United States. Likewise, Kwaśny is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kwasny | Germany, Canada, France, Poland, United States |
| Kwaśny | United Kingdom, Poland, United States, Germany |
| kazimierz kwaśny PL (b. 1900) |
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marcin kwaśny Polish actor, PL (b. 1979) |
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| michał kwaśny (b. 1919) |
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| zbigniew kwaśny Polish historian, PL (b. 1930) |
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| wiesław kwaśny Polish violinist, PL (b. 1950) |
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| zdzisław kwaśny Polish hammer thrower, PL (b. 1960) |
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| adam kwaśny Polish actor, PL (b. 1962) |
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| dorota kwaśny Polish sportsperson, PL (b. 1972) |
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| piotr kwaśny Polish violinist (b. 1979) |
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| waldemar kwaśny researcher |
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| michał kwaśny Polish physicist (Warsaw University of Technology), PL |
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| mirosław kwaśny researcher |
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Jan, Darek, Dawid, Jacek, Jarek, Jakub, Jerzy, Julia, Tomek, Edyta, Filip, Iwona, Marian, Marcin, Maciej, Monika, Sylwia, Szymon, Adrian, Cezary, Bartek, Karina, Daria, Roman, Rafał, Piotr, Ewa, Ola, Ula, Sara, Anna, Ania, Arek, Adam, Olga, Marek, Kacper, Aneta, Agata, Basia, Beata, Karol, Kamil, Kasia, Kinga, Kicia, Paula, Paweł, Artur, and Konrad