Family name Третяк (Tretiak 
, Третяк 
, Tretyak 
) , throughout the world, is a common cognomen. The cognomen Третяк is habitual in Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Lithuania. In absolute terms, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus.
| третяк юрій дмитрович botanist (1894-1960), UA (b. 1894) |
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| третяків-сосницький олександр painter (1896-1940), UA (b. 1896) |
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третяк, борис никитович UA (b. 1937) |
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третяк корнилій романович UA (b. 1958) |
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| василь якович третяк Soviet singer and opera singer (1926-1989), RU (b. 1926) |
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| третякова валентина петрівна UA (b. 1932) |
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| третяк антон миколайович UA (b. 1949) |
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| сергей александрович третяк researcher (b. 1968) |
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| третяк леонід олександрович UA (b. 1958) |
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| третяк пётр анатольевич Ukrainian military personnel, UA (b. 1972) |
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| третяк сергій вікторович Ukrainian footballer (born 1984), UA (b. 1984) |
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| третяк олександр євгенович Ukrainian military personnel, UA (b. 1989) |
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| третяк сергій валерійович Ukrainian military personnel, UA (b. 1992) |
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| третяк, милена олеговна Russian ice hockey goaltender, RU |
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Ян, Неля, Нина, Нона, Ніна, Ніла, Вера, Влад, Віта, Віра, Лада, Леля, Леся, Ліна, Ліда, Люба, Люся, Женя, Олег, Илья, Инна, Иван, Діна, Дима, Дина, Дар'Я, Єн, Зоя, Лев, Ира, Рая, Яна, Єва, Коля, Кира, Клим, Елла, Кіра, Майя, Марк, Мері, Алла, Анна, Адам, Гліб, Глєб, Петр, Дана, Макс, and Емма