Surname Mastroianni (Mastroianni 
, Мастроянни, Мастрояни 
) , all around the world, is a common cognomen. The cognomen Mastroianni is habitual in Italy, where it is quite a common surname, Uruguay, where it is quite a rare surname, and Argentina. Not in comparison with a country's population, it most frequently occurs in Italy, the United States, and Argentina. Much less frequently, Mastroianni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mastroianni | Italy, Canada, United States, Argentina, France |
| Мастрояни | Ukraine |
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umberto mastroianni Italian artist (1910-1998), IT (b. 1910) |
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marcello mastroianni Italian actor (1924–1996), IT (b. 1924) |
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| domenico mastroianni Italian artist, 1877-, IT (b. 1876) |
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ruggero mastroianni Italian film editor (1929-1996), IT (b. 1929) |
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| daphine doster mastroianni U.S. military veteran, US (b. 1906) |
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mark g. mastroianni United States District Judge of the United States District Court for the District of Massachusetts, US (b. 1964) |
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pat mastroianni Canadian actor (1971-), CA (b. 1971) |
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chiara mastroianni French actress, FR (b. 1972) |
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| luigi mastroianni American physician (1925-2008), US (b. 1925) |
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| luigi mastroianni cyclist, IT (b. 1927) |
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| giovanni mastroianni (b. 1921) |
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darin mastroianni Major League Baseball outfielder in the Toronto Blue Jays organization, US (b. 1985) |
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| armand mastroianni American film director, US (b. 1948) |
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| barbara mastroianni (1951-2018) costume, costume designer (b. 1951) |
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| victor mastroianni French association football player, FR (b. 1958) |
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