Family name Kozłowski (Kozlowski 
, Козловский 
, Kozłowski 
) , around the globe, is a common cognomen. The last name Kozłowski is habitual in Eastern Europe, particularly Belarus, where it is quite a common surname, Poland, and Russia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Poland, Russia, and the United States. Likewise, Kozłowski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kozlowski | Germany, France, Brazil, United States, Poland |
| Козловский | Kazakhstan, Ukraine, Kyrgyzstan, Belarus, Russia |
| Kozłowski | Germany, France, United States, United Kingdom, Poland |
Kozioł, Kozlovski, Kozlovskij, Kozlovsky, Казлоўскі, Козловський, and קוזלובסקי
| antoni kozłowski (b. 1729) |
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| józef kozłowski Russian composer, PL (b. 1757) |
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| jan paweł kozłowski PL (b. 1759) |
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| mateusz kozłowski PL (b. 1764) |
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| józef kozłowski PL (b. 1770) |
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| anastazy kozłowski UA (b. 1778) |
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władysław kozłowski (b. 1836) |
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karol kozłowski Polish architect, PL (b. 1847) |
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| wiktor kozłowski (b. 1791) |
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| felicjan kozłowski Polish historian, PL (b. 1805) |
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włodzimierz kozłowski Polish politician, PL (b. 1858) |
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stanisław gabriel kozłowski Polish writer and literary critic (1860-1922), PL (b. 1860) |
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| józef gabriel kozłowski PL (b. 1800) |
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edward kozłowski Polish-American bishop (1860-1915), PL (b. 1860) |
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| feliks kozłowski PL (b. 1803) |
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Max, Pawel, Paweł, Peter, Piotr, Radek, Rafal, Rafał, Roman, Remik, Remek, Denis, Darek, Dawid, Diana, Grzes, Lukas, Janek, Jacek, Jarek, Jasiu, Jakub, Pavel, Jerzy, Kazik, Karol, Jan, Mati, Maks, Alan, Arek, Adam, Kuba, Leon, Lech, Eryk, Emil, Irek, Igor, Olek, Marek, Mirek, Miron, Aleks, Artur, Chris, Borys, Kamil, and Tomek