Family name Duc (Duc 
, Duque 
, Дык 
, among others...) , globally, is a widespread cognomen. The last name Duc is habitual in Colombia, where it is a common surname, Venezuela, where it is quite a common surname, and Portugal (explore the name in all countries). In absolute terms, the name is most common in Colombia, Philippines, and Vietnam. Very seldom, Duc is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duc, Dux | Vietnam, Philippines, Mexico, Colombia, Brazil |
| Duque | Philippines, Mexico, Colombia, Brazil, Venezuela |
| Дык | Russia, Belarus |
| cristoforo duc IT (b. 1503) |
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| philippe duc Belgian composer, BE (b. 1550) |
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| fronton du duc French Jesuit theologian, FR (b. 1558) |
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philippe, duc d'anjou Prince of France, FR (b. 1730) |
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| anthony le duc 1723 - (b. 1723) |
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| louis-philippe-joseph, duc de chartres French drawer, FR (b. 1726) |
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| jean jacques duc goldsmith active in St. Petersburg (fl.1770-1785), DE (b. 1750) |
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joseph-louis duc French architect, FR (b. 1802) |
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| jean-joseph duc (b. 1748) |
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| benoit louis le duc (1764-1837) (b. 1764) |
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| anne jean pascal chrysostome duc-lachapelle French politician (1765-1814), FR (b. 1765) |
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louis léouzon le duc French writer, journalist, translator and historian, FR (b. 1815) |
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william gates le duc fourth United States Commissioner of Agriculture (1823-1917), US (b. 1823) |
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| françois duc (b. 1770) |
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joseph-auguste duc Italian mountaineer, IT (b. 1835) |
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