Family name Košćak (Košćak 
) , in all the world, is a rare surname. The surname Košćak is habitual in Southern Europe, particularly Croatia, where it is quite a common surname.
| ivan košćak theologian and canon, HR (b. 1851) |
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| vladimir košćak (1921-1999) historian, HR (b. 1921) |
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| mladen košćak association football player |
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| božidar košćak actor |
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| laura košćak researcher |
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Mia, Antun, Anita, Anica, Paula, Petra, Petar, Romeo, Ruža, Denis, Dejan, Dario, Darko, Davor, Damir, Goran, Laura, Janko, Jasna, Jakov, Josip, Vendi, Sanja, Mirko, Matea, Matej, Ana, Jan, Tom, Tea, Eva, Iva, Maki, Alen, Dina, Dora, Vesna, Lana, Luka, Tena, Tina, Ines, Ivan, Ivka, Igor, Mario, Marta, Marko, Lina, and Filip