Family name Cosac (Cosac 
, Косак 
) , around the globe, is quite a rare last name. The last name Cosac is habitual in Eastern Europe, particularly Romania, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine. Not in comparison with a country's population, it is the most numerous in Romania, Brazil, and Ukraine. Very seldom, Cosac is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cosac | Germany, Romania, Italy, United States, Brazil |
| Косак | Russia, Kazakhstan, Ukraine, Belarus |
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george cosac Romanian tennis player, RO (b. 1968) |
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| lamis cosac Brazilian politician, BR (b. 1950) |
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| laura cosac actor, RO |
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| rubens cosac Brazilian politician, BR |
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| charles cosac Brazilian businessman, BR |
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| ricardo cosac Brazilian race car driver, BR |
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| adrian cosac Romanian politician from Vlădești, Vâlcea County, RO |
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Mr, Calin, Cathy, Crina, Paula, Paulo, Pedro, Radif, Denis, David, Diego, Gilva, Laura, Livia, Lucas, Luana, Jorge, Thaiz, Nando, Nadir, Nazir, Elias, Alina, Alice, Selma, Saada, Ms, Ana, Dan, Ian, Seme, Alex, Anna, Aziz, Rana, Radu, Elena, Rita, Jose, Joao, Jean, Nick, Vera, Olga, Zana, Maria, Marta, Marco, Luiz, and Erika