Surname Marcu (Марк 
, Марко 
, Marcu 
) , throughout the world, is a common last name. The cognomen Marcu is habitual in Eastern Europe, particularly Romania, where it is a common surname, Bulgaria, where it is quite a common surname, and Moldova (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Eastern Europe, particularly Romania, Bulgaria, and Ukraine. Likewise, Marcu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Марк | Bulgaria, Kazakhstan, Belarus, Ukraine, Russia |
| Марко | Bulgaria, Kazakhstan, Ukraine, Serbia, Russia |
| Marcu | Bulgaria, Moldova, Italy, Romania, Russia |
| Марку | Kazakhstan, Romania, Ukraine, Kyrgyzstan, Russia |
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marcu cercel prince of Moldavia, RO (b. 1580) |
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ioan marcu Romanian, delegate to the Great National Assembly of Alba Iulia (1866-1935), RO (b. 1866) |
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izidor marcu RO (b. 1858) |
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| duiliu marcu Romanian architect, RO (b. 1885) |
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| alexandru marcu Romanian philologist, RO (b. 1894) |
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| valeriu marcu Biographer, poet and writer, RO (b. 1899) |
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dumitru marcu association football player, RO (b. 1950) |
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| orest marcu (b. 1898) |
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| george marcu Romanian musician (b. 1913) |
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| eva marcu (b. 1907) |
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| marcu botzan (b. 1913) |
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norbert marcu gymnast, RO |
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mihaela marcu rumenian soprano, RO |
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| marcu gabinschi Soviet Moldavian linguist, MD (b. 1932) |
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| paul marcu Romanian footballer (1939-2004), RO (b. 1939) |
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