Family name Kwaśniak (Kwaśniak 
) , in all the world, is quite a rare last name. The surname Kwaśniak is habitual in Poland, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United Kingdom.
| VARIANT | COUNTRY |
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| Kwaśniak | Poland, United Kingdom, Germany, United States |
| tadeusz kwaśniak Polish pedophile and serial killer (1951-1991), PL (b. 1951) |
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| wojciech kwaśniak Polish government official (b. 1962) |
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| mieczysław kwaśniak PL (b. 1954) |
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| robert kwaśniak PL (b. 1966) |
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| grzegorz kwaśniak PL (b. 1966) |
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| konrad kwaśniak researcher (ORCID 0000-0003-1525-7178) |
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| jan kwaśniak |
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Jan, Roman, Daria, Dawid, Jacek, Jarek, Jakub, Julia, Tomek, Hanna, Filip, Iwona, Zuzia, Marcin, Maciej, Monika, Milena, Sylwia, Alicja, Adrian, Bartek, Karina, Rafał, Piotr, Paweł, Kinga, Ela, Ewa, Ola, Maja, Anna, Ania, Arek, Adam, Kuba, Emil, Kamila, Igor, Marta, Marek, Mirek, Alina, Aneta, Agata, Beata, Karol, Kamil, Kasia, Olga, and Kacper