Surname Kucljak (Kucljak 
) , in the entire world, is a rare last name. The cognomen Kucljak is habitual in Croatia, where it is quite a rare surname, and Germany, where it is an extremely rare surname.
Ana, Vlatka, Zdenko, Martina, Andreja, Predrag, Danijel, Dominik, Domagoj, Gordana, Željko, Kristina, Dragutin, Gabrijel, Štefica, Anamarija, Lidija, Gloria, Branka, Ankica, Biba, Deni, Ivan, Mirta, Simon, Dejan, Davor, Valentina, Damir, Ivana, Ivona, Ivica, Žuan, Marija, Mateja, Mihael, Nenad, and Valentino