Family name Košak (Кошак 
, Košak 
) , all around the world, is quite a rare cognomen. The cognomen Košak is characteristic of Slovenia, where it is quite a rare surname, Croatia, and Ukraine. Measured by absolute frequency, it most frequently occurs in Ukraine, Croatia, and Russia.
| VARIANT | COUNTRY |
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| Кошак | Kyrgyzstan, Russia, Kazakhstan, Ukraine, Belarus |
| Košak | Croatia, Slovenia |
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vladimir košak Croatian economist, lawyer, politician and diplomat, HR (b. 1908) |
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vinko košak SI (b. 1903) |
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miha košak Slovene manager and politician (1932-2019), SI (b. 1932) |
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| milan košak (b. 1898) |
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| hinko košak SI (b. 1916) |
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| gregor košak Gregor Košak * 21. 2. 1932 , Lublaň (Ljubljana) , Slovinsko (Slovenia) architect, graphic designer sex: male notes: NKP ne 2018/08, SI (b. 1932) |
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| marija košak SI (b. 1933) |
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| peter košak Slovene poet, SI (b. 1943) |
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| andrej košak Slovene film director and screenwriter, SI (b. 1965) |
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| mitja košak SI (b. 1966) |
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| jurij košak film producer |
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| aleš košak SI (b. 1974) |
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| aljoša košak SI |
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| karl košak SI |
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| alenka košak SI |
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Ana, Blaž, Karin, Kruno, Klara, Pavao, Petra, Denis, Dejan, Darja, David, Davor, Diana, Goran, Grega, Laura, Liana, Janez, Josip, Jošt, Tilen, Nives, Bojan, Boris, Anže, Aleš, Leo, Tim, Eni, Eva, Miro, Miha, Sven, Lara, Leon, Luka, Vinko, Jana, Nika, Ines, Ivan, Zala, Mario, Marta, Marko, Matic, Sanja, Sonia, Jaka, and Vesna