Family name Demczuk (Demczuk 
) , in the entire world, is quite a rare cognomen. The cognomen Demczuk is characteristic of Poland, where it is quite a rare surname, Argentina, where it is a rare surname, and Austria. In absolute terms, it is the most numerous in Poland, Brazil, and Argentina. Also, Demczuk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demczuk | Brazil, Argentina, United States, Germany, Poland |
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ryszard demczuk Polish officer, PL (b. 1959) |
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| zofia demczuk Polish Righteous Among the Nations, PL (b. 1925) |
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| witaliusz demczuk UA (b. 1916) |
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| ewa demczuk-włodarczyk Polish university teacher, PL (b. 1958) |
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| lisa demczuk researcher ORCID ID = 0000-0001-9891-3139 |
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| gabriella demczuk lebanese-American artist and documentary photographer |
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| walter demczuk researcher |
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| sergiusz demczuk researcher |
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| agnieszka demczuk PL |
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