Cognomen Duk (Duc 
, Duk 
, Дук 
) , across the world, is a common family name. The family name Duk is habitual in Vietnam, where it is quite a common surname, Switzerland, and Macao, where it is quite a rare surname. In absolute terms, the name is most common in Vietnam, France, and Malaysia. Likewise, Duk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duc | Poland, Vietnam, United States, Democratic Republic of the Congo, France |
| Duk | Poland, Vietnam, United States, Malaysia, France |
| Дук | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
| Док | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
| august duk (b. 1798) |
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józef duk PL (b. 1947) |
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wierd duk Dutch journalist and historian, NL (b. 1959) |
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| wim duk university teacher, NL (b. 1918) |
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yasmani duk Bolivian footballer, BO (b. 1988) |
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joosje duk Dutch actress, NL (b. 1994) |
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| donald duk Dutch artist, NL (b. 1948) |
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| duk young jeon researcher (ORCID 0000-0001-6969-0773) |
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| duk yoon kim researcher |
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| duk hee lee researcher (ORCID 0000-0003-1596-9968) |
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| duk hee lee researcher (ORCID 0000-0001-5992-5284) |
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| duk hyun sung researcher |
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| duk bong lee botanist |
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| duk l na researcher (ORCID 0000-0003-1572-7862) |
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| duk won bang researcher |
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