Surname Kostović (Степанович 
, Kostović 
) , in all the world, is quite a common last name. The cognomen Kostović is habitual in Kazakhstan, where it is quite a common surname, Belarus, where it is quite a rare surname, and Croatia. Measured by absolute frequency, it is commonest in Kazakhstan, Russia, and Belarus.
| VARIANT | COUNTRY |
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| Степанович | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Kostović | Serbia, Croatia |
| ante kostović Croatian sculptor, HR (b. 1915) |
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| ivica kostović Croatian politician and physician, HR (b. 1943) |
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| dario kostović Croatian ice hockey player, CH (b. 1980) |
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| ivica kostović researcher (ORCID 0000-0002-4090-4114) |
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Mia, Jasna, Frane, Ivana, Ivica, Zoran, Uroš, Marija, Milica, Suzana, Robert, Dijana, Dušan, Joško, Nikola, Nikša, Veljko, Ivanka, Mirjana, Andreja, Anđela, Raphael, Lovre, Laura, Dunja, Davor, Ana, Dar, Ivo, Mate, Mira, Ante, Anja, Anka, Roko, Dino, Ljubica, Luka, Nina, Emil, Ines, Ivan, Marin, Mario, Matea, Milan, Boris, Dario, Toni, and Tatjana