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Last name Žák (Žák , Żak ) , worldwide, is quite a common cognomen. The cognomen Žák is habitual in Eastern Europe, particularly Czechia, where it is quite a common surname, Poland, and Slovakia, where it is quite a rare surname.
Dan, Pavol, Peter, Radim, Radek, Roman, Robin, René, David, Laďa, Libor, Jarda, Jakub, Josef, Johny, Jozef, Juraj, Jirka, Tomas, Honza, Vojta, Vlado, Pavel, Kamil, Karel, Boris, Jan, Ivo, Mayo, Samo, Adam, Kuba, Petr, Pepa, Ruda, Erik, Filip, Emil, Ivan, Olda, Marko, Marek, Matej, Milan, Mirek, Míra, Aleš, Alois, Vít, and Ondra