Cognomen Rienzo (Rienzo 
) , in all the world, is quite a rare last name. The cognomen Rienzo is characteristic of Italy, where it is quite a rare surname, Uruguay, and Switzerland, where it is a rare surname. Not in comparison with a country's population, the name is most common in Italy, the United States, and Brazil. Very seldom, Rienzo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rienzo | Italy, France, Brazil, United States, Argentina |
| rienzo colla Italian publisher (1921-2009), IT (b. 1921) |
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andre rienzo baseball player, BR (b. 1988) |
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| franca di rienzo French singer of Italian origin, FR (b. 1938) |
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| ricardo josé de rienzo Argentinian association football player (1948-2013), AR (b. 1948) |
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| julio di rienzo Argentine biologist, AR (b. 1950) |
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| joe di rienzo (b. 1948) |
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| maria di rienzo Italian writer, IT (b. 1959) |
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| monica rienzo researcher |
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| franck di rienzo researcher (ORCID 0000-0001-7920-8709) |
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| mayri alejandra diaz de rienzo researcher |
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| valentina di rienzo researcher |
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| brunella di rienzo researcher |
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| matthew rienzo researcher ORCID ID = 0000-0002-9389-1310 |
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| assunta de rienzo researcher |
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| giovanni rienzo Italian actor, IT (b. 1980) |
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