Cognomen Demchuk (Демчук 
, Demchuk 
) , globally, is a common surname. The family name Demchuk is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Russia, where it is quite a rare surname.
| teofil demchuk Ukrainian actor, PL (b. 1896) |
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| tatyana demchuk Ukrainian Righteous Among the Nations, UA (b. 1931) |
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| volodymyr osyp demchuk (b. 1922) |
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| stepan demchuk Ukrainian writer, PL (b. 1934) |
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| andriy demchuk Ukrainian weightlifter, UA (b. 1974) |
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| dmitry v demchuk researcher (ORCID 0000-0002-8564-1725) |
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| eugene demchuk researcher |
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| andrew m demchuk researcher |
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| david demchuk Canadian writer, CA |
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| oleg m demchuk researcher ORCID ID = 0000-0002-5571-1593 |
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| antonina demchuk researcher |
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| pavlo demchuk Ph.D. Rice University 2012 |
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| aubrey demchuk researcher |
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| zoriana demchuk researcher |
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| mariyana demchuk Ukrainian association football player, UA |
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