Cognomen Демчук (Демчук 
, Demchuk 
, Demčuk) , throughout the world, is a common family name. The last name Демчук is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Russia, where it is quite a rare surname.
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| Демчук | Kazakhstan, Ukraine, Belarus, Poland, Russia |
| Demchuk | Belarus, Canada, United States, Argentina, Russia |
| Demtchouk | United States |
| демчук дмитро politician, UA (b. 1895) |
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| демчук осип UA (b. 1888) |
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николай васильевич демчук Russian politician, RU (b. 1949) |
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| сергій демчук Ukrainian Paralympic swimmer, UA (b. 1901) |
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| демчук, иван нестерович Soviet teacher, RU (b. 1903) |
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демчук анатолій васильович Ukrainian artist, UA (b. 1958) |
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| демчук петро іванович UA (b. 1900) |
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| демчук ілля степанович UA (b. 1921) |
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| демчук володимир осипович UA (b. 1922) |
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| демчук йосип васильович UA (b. 1923) |
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андрій богданович демчук Ukrainian wheelchair fencer, UA (b. 1987) |
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демчук сергій ігорович UA (b. 1983) |
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| демчук юрій васильович UA (b. 1937) |
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| демчук галина костянтинівна actor, UA (b. 1947) |
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| демчук василь гервасійович Ukrainian military personnel (1972-2015), UA (b. 1972) |
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Ян, Адам, Афія, Гліб, Поль, Петр, Дана, Дар'Я, Даша, Дима, Діна, Діма, Надя, Наум, Неля, Нина, Ніка, Ніна, Ніла, Ваня, Вася, Вера, Анна, Алія, Алла, Міла, Аля, Аня, Ада, Ася, Дан, Зоя, Лев, Лія, Жан, Оля, Вика, Яна, Юра, Єва, Катя, Коля, Кіра, Макс, Майя, Марк, Миша, Міля, Юля, and Вова