Last name Kosiński (Косинский 
, Kosiński 
) , around the globe, is quite a rare surname. The last name Kosiński is habitual in Eastern Europe, particularly Poland, where it is quite a rare surname, Belarus, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
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| Косинский | Belarus, Ukraine, Kazakhstan, Russia |
| Kosiński | United Kingdom, Poland, France, Germany, United States |
Kosinski, Kosinskij, Kosinsky, Kossinski, Kosynskyi, Kozinski, Kozynskyi, Козинський, and Косинський
| andrzej kosiński PL (b. 1584) |
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| stanisław kosiński PL (b. 1587) |
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| antoni kosiński Polish architect, PL (b. 1650) |
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józef kosiński Polish painter (1753-1821), PL (b. 1753) |
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antoni amilkar kosiński Polish general, PL (b. 1769) |
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władysław euzebiusz kosiński PL (b. 1814) |
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julian kosiński Polish surgeon (1833-1914), LT (b. 1833) |
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| adam amilkar kosiński Polish novelist and heraldist, PL (b. 1815) |
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włodzimierz kosiński PL (b. 1871) |
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ignacy kosiński PL (b. 1874) |
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| władysław kosiński Polish philologist and etnographer (1844-1914), PL (b. 1844) |
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| stanisław rawicz kosiński PL (b. 1847) |
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władysław kosiński PL (b. 1901) |
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jan kazimierz kosiński Polish scenographer, theatrologist and essayist (1916-1974), PL (b. 1916) |
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leszek kosiński Polish-born Canadian geographer, PL (b. 1929) |
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Jan, Jarek, Jakub, Jerzy, Tomek, Filip, Oskar, Zenon, Marian, Marcin, Maciej, Maciek, Samuel, Szymon, Albert, Antoni, Adrian, Cezary, Czarek, Bartek, Bogdan, Kacper, Jacek, Dawid, David, Darek, Alan, Arek, Adam, Kuba, Kris, Toni, Eryk, Emil, Igor, Olaf, Konrad, Marek, Artur, Borys, Karol, Kamil, Paweł, Piotr, Radek, Rafal, Rafał, Roman, Mirek, and Patryk