Cognomen Kościelniak (Kościelniak 
) , around the globe, is quite a rare family name. The last name Kościelniak is characteristic of Poland, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United States.
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| Kościelniak | United Kingdom, Poland, Germany, United States |
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mieczysław kościelniak Polish artist (1912-1993), PL (b. 1912) |
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| tadeusz kościelniak painter (1910-1996) (b. 1910) |
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| władysław kościelniak Polish painter (1916-2015), PL (b. 1916) |
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| jan kościelniak PL (b. 1925) |
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| jan kościelniak Polish politician, PL (b. 1936) |
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| zbigniew kościelniak badminton player, PL (b. 1939) |
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| paweł kościelniak Polish chemist, PL (b. 1952) |
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| cyprian kościelniak PL (b. 1948) |
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| jacek kościelniak Polish politician, PL (b. 1963) |
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| krzysztof kościelniak Polish historian, PL (b. 1965) |
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| paweł kościelniak badminton player, PL (b. 1973) |
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| ireneusz kościelniak Polish association football player, PL (b. 1974) |
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| wojciech kościelniak PL (b. 1965) |
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| jolanta kościelniak researcher (ORCID 0000-0003-1578-1519) |
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| paulina kościelniak researcher |
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Jan, Kamil, Kasia, Kinga, Paweł, Piotr, Rafał, Dawid, Jacek, Jakub, Jerzy, Julia, Julka, Tomek, Edyta, Filip, Ilona, Iwona, Marcin, Madzia, Maciej, Monika, Beata, Basia, Agata, Artur, Ela, Ewa, Iga, Iza, Iwo, Ola, Maja, Alan, Anna, Ania, Milena, Arek, Asia, Kuba, Eryk, Maria, Marta, Marek, Monia, Mirek, Anita, Aneta, Adam, and Michal