Cognomen Sęk (Sęk 
) , across the world, is quite a rare family name. The surname Sęk is habitual in Poland, where it is quite a rare surname, and the United Kingdom, where it is an extremely rare surname. Very seldom, Sęk is the forename as well as the last name.
| karol sęk Polish officer, PL (b. 1893) |
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paweł sęk Polish-American composer, PL (b. 1977) |
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szymon szynkowski vel sęk Polish politician and deputy, PL (b. 1982) |
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| helena sęk Polish psychologist, PL (b. 1938) |
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| benedykt sęk PL (b. 1932) |
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| danuta sęk PL (b. 1935) |
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| jan sęk Polish politician, PL (b. 1948) |
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| aleksander sęk Polish physicist, PL (b. 1957) |
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| robert sęk Polish association football player, PL (b. 1967) |
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| aleksandra sęk researcher |
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| grzegorz sęk Polish physicist |
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| sławomir sęk researcher, PL |
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| dariusz sęk boxer, PL (b. 1986) |
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Ala, Kamil, Kasia, Kinga, Paweł, Piotr, Rafał, Roman, Dawid, Gosia, Jacek, Jarek, Jakub, Jerzy, Julia, Julka, Tomek, Edyta, Filip, Ilona, Iwona, Zuzia, Karol, Beata, Agata, Artur, Ada, Jan, Ela, Ewa, Iza, Ola, Mati, Anna, Ania, Arek, Zofia, Adam, Kuba, Gabi, Jola, Olga, Maria, Marta, Marek, Magda, Anita, Aneta, Asia, and Marian