Surname Kłak (Клак 
, Kłak 
) , in the entire world, is quite a rare last name. The family name Kłak is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Ukraine, and Belarus, where it is a rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Poland, Ukraine, and Russia.
| VARIANT | COUNTRY |
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| Клак | Kazakhstan, Russia, Ukraine, Belarus |
| Kłak | Poland, United Kingdom |
| czesław kłak Polish historian of literature, PL (b. 1935) |
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| tadeusz kłak (b. 1932) |
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| stanisław kłak Polish trade unionist, PL (b. 1954) |
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| krzysztof kłak Polish politician and deputy, PL (b. 1966) |
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| aleksander kłak Polish footballer, PL (b. 1970) |
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| julia kłak researcher, PL |
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| anna kłak Polish researcher, PL |
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| marlena kłak researcher ORCID 0000-0003-2430-5346 |
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| marlena kłak researcher (ORCID 0000-0002-9831-3026) |
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| franciszek kłak PL |
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| czesław kłak PL (b. 1981) |
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| andrzej kłak PL (b. 1982) |
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Jan, Monika, Sandra, Amelia, Bartek, Patryk, Robert, Renata, Daniel, Damian, Dorota, Lucyna, Joanna, Tomasz, Emilia, Iaryna, Wojtek, Mariusz, Martyna, Marlena, Mateusz, Michał, Marcin, Iwona, Filip, Hanna, Ewa, Ola, Anna, Adam, Asia, Emil, Marta, Alina, Artur, Agata, Andrzej, Beata, Kamil, Kasia, Kinga, Paweł, Piotr, Rafał, Gosia, Jacek, Jakub, Julia, Karol, and Czesław