Cognomen Koščak (Koščak 
, Кощак 
) , globally, is a rare family name. The last name Koščak is habitual in Croatia, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Ukraine, where it is a rare surname.
| jozef koščak Czechoslovak Olympic runner (1903-1979), SK (b. 1903) |
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| mladen koščak Croatian footballer (1936-1997), HR (b. 1936) |
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| lučka koščak Slovenian sculptor, SI (b. 1957) |
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| alenka petrovec-koščak SI |
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| marko koščak SI |
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| jana koščak Croatian heptathlete, HR |
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Ana, Mirko, Boris, Bojan, Karlo, Klara, Petra, Peter, Denis, Dejan, Dario, Darko, Darja, Davor, Damir, Domen, Lovro, Jakov, Josip, Tajda, Nenad, Vesna, Mateo, Manca, Marko, Marta, Eva, Mara, Maja, Miha, Sara, Seba, Alen, Ante, Anja, Anka, Filip, Kata, Lana, Luka, Jana, Tomo, Nada, Nika, Ines, Ivan, Igor, Mario, Dora, and Irena