Cognomen Kosmač (Kosmač 
, Космач 
) , all over the world, is quite a rare surname. The surname Kosmač is habitual in Slovenia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Croatia. Not in comparison with a country's population, the name is most common in Belarus, Slovenia, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Kosmač | Slovenia, Croatia |
| Космач | Belarus, Russia, Kazakhstan, Ukraine |
| jurij kosmač SI (b. 1799) |
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| frančišek kosmač SI (b. 1817) |
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| anton kosmač Austria-Hungary politician (1854-1916) (b. 1854) |
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| france kosmač SI (b. 1845) |
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ciril kosmač Slovenian writer (1910-1980), SI (b. 1910) |
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| mihael kosmač SI (b. 1862) |
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| josip kosmač SI (b. 1863) |
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france kosmač (b. 1922) |
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rudi kosmač Yugoslavian actor (1932-1981) (b. 1932) |
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janez kosmač SI (b. 1932) |
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| franc kosmač SI (b. 1909) |
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anton kosmač Slovenian athlete, SI (b. 1976) |
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| angel kosmač IT (b. 1923) |
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| marija dunja piškur-kosmač Slovenian physician and politician, SI (b. 1941) |
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| janko kosmač SI (b. 1941) |
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Ana, Blaž, Katja, Peter, Damir, Domen, Grega, Janez, Janko, Neven, Neža, Erika, Urban, Uroš, Urša, Žiga, Matija, Mateja, Alenka, Aljaž, Boštjan, Danilo, Anže, Anica, Sarah, Miran, Ina, Maja, Miha, Sara, Alex, Alan, Adam, Petr, Dean, Jaka, Gorazd, Juš, Tais, Nika, Nina, Igor, Mario, Marko, Matic, Matej, Maša, Mojca, Ján, and Gregor