Family name Демьянов (Демьянов 
, Dem'Yanov , Demianov 
) , around the world, is quite a common last name. The cognomen Демьянов is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Russia, and Moldova. Measured by absolute frequency, this name is the most popular in Russia, Belarus, and Kazakhstan.
| VARIANT | COUNTRY |
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| Демьянов | Kazakhstan, Ukraine, Moldova, Belarus, Russia |
| Dem'Yanov | Belarus, Ukraine |
| Demianov | Finland, Ukraine, Moldova, United States, Russia |
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николай яковлевич демьянов Russian chemist, RU (b. 1861) |
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демьянов, александр алексеевич RU (b. 1865) |
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| демьянов, митрофан михайлович BY (b. 1888) |
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демьянов, анатолий илларионович RU (b. 1942) |
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| демьянов, александр петрович RU (b. 1910) |
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| демьянов, геннадий петрович RU (b. 1920) |
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| демьянов, юрий андреевич Russian scientist, RU (b. 1931) |
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| демьянов, иван никитович RU (b. 1923) |
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| демьянов, анатолий демьянович RU (b. 1925) |
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| владимир васильевич демьянов politician, UA (b. 1943) |
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| демьянов, владимир фёдорович RU (b. 1938) |
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| михаил иванович демьянов BY (b. 1955) |
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| демьянов, михаил емельянович RU (b. 1955) |
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Ян, Ігор, Юрий, Юрик, Юрій, Костя, Кирил, Алекс, Антон, Айлян, Іван, Артем, Артём, Борис, Павел, Певел, Данил, Денис, Вадим, Захар, Игорь, Артур, Яков, Стас, Саша, Лев, Юра, Коля, Макс, Марк, Миша, Глеб, Паша, Петр, Дима, Ваня, Вася, Вова, Влад, Леня, Женя, Олег, Илья, Иван, Егор, Саня, Игнат, and Ергей