Cognomen Казак (Kosak 
, Казак 
, Kazak 
) , in all the world, is a common surname. The last name Казак is characteristic of Belarus, where it is quite a common surname, Slovenia, and Turkey. In absolute terms, it is commonest in Turkey, Russia, and Belarus. Much less frequently, Казак is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kosak | Germany, Poland, United States, Slovenia, Turkey |
| Казак | Moldova, Ukraine, Kazakhstan, Belarus, Russia |
| Kazak | Germany, Poland, United States, Syria, Turkey |
| Kasack | Brazil, United States, Germany |
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казак, ярослав иванович politician, UA (b. 1944) |
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мікалай станіслававіч казак Soviet physicist, BY (b. 1945) |
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| казак, дмитрий васильевич Hero of the Soviet Union, UA (b. 1907) |
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| казак, иван корнилович RU (b. 1900) |
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| казак, павел корнилович UA (b. 1901) |
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| казак, манфред антонович RU (b. 1908) |
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| казак, иван емельянович RU (b. 1919) |
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| генадзь казак BY (b. 1924) |
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| казак, виктор дмитриевич RU (b. 1928) |
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| уладзімір еўдакімавіч казак BY (b. 1936) |
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| казак, леонид васильевич politician, UA (b. 1947) |
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| наталья ивановна казак Soviet rower (b. 1960) |
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| метин казак Bulgarian politician, BG (b. 1972) |
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| людмила казак Belarusian lawyer, BY |
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| казак, яков Belarusian footballer, BY (b. 1985) |
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Ян, Петр, Пётр, Дана, Дар'Я, Дина, Дима, Діну, Неля, Нина, Паша, Ніна, Вера, Вова, Влад, Віта, Віра, Лада, Лена, Леха, Люся, Ніла, Гліб, Баха, Анна, Аня, Нур, Зоя, Лев, Ида, Ион, Еіп, Рая, Яна, Юля, Юра, Єва, Катя, Кызы, Макс, Марк, Маша, Мира, Миша, Алик, Алла, Лёша, and Олег