Last name Cazacu (Cazacu 
, Казаку 
, Цазацу ) , around the globe, is a common surname. The cognomen Cazacu is characteristic of Moldova, where it is a common surname, Romania, where it is quite a common surname, and Maldives, where it is quite a rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Romania, Moldova, and Russia. Very seldom, Cazacu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cazacu | Romania, Moldova, Spain, Italy, Afghanistan |
| Казаку | Kazakhstan, Russia, Ukraine, Belarus |
| Цазацу | Russia |
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petru cazacu Moldovan politician, RO (b. 1873) |
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| boris cazacu Romanian philologist, RO (b. 1919) |
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| ilie cazacu (b. 1912) |
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| virgil cazacu Romanian politician, RO (b. 1927) |
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| cabiria andreian cazacu Romanian mathematician, RO (b. 1928) |
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| luminița cazacu Romanian film director, RO (b. 1940) |
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| vasile-mircea cazacu Romanian politician, RO (b. 1943) |
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| valeriu cazacu actor (1948-2020), MD (b. 1948) |
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| cornelia cazacu Romanian politician, RO (b. 1955) |
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| valentina cazacu actor (b. 1956) |
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| alexandru cazacu (b. 1949) |
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| florin cazacu Romanian politician from Brad, Hunedoara County, RO (b. 1965) |
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| eduard cazacu Romanian politician from Murgeni, Vaslui County, RO |
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| silviu-marius cazacu Romanian politician from Izvoarele, Giurgiu County, RO |
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| marinică cazacu Romanian politician from Ion Roată, Ialomița County, RO |
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Mr, Anna, Anca, Aura, Cati, Bobi, Katy, Paul, Radu, Raul, Anah, Roni, Rica, Rita, Ritu, Dani, Dana, Dany, Danu, Dinu, Dima, Relu, Andy, Andi, Alin, Ms, Ala, Ana, Adi, Rod, Dan, Geo, Lia, Jan, Emi, Ina, Ion, Mari, Mara, Maia, Mona, Meri, Miti, Sara, Sebi, Alex, Dora, and Doru