Family name Troisi (Troisi 
) , all over the world, is quite a common last name. The surname Troisi is characteristic of Italy, where it is quite a rare surname, Malta, and Moldova. Measured by absolute frequency, it most frequently occurs in Italy, the United States, and Argentina. Very seldom, Troisi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Troisi | Moldova, Argentina, France, Italy, United States |
| pietro paolo troisi MT (b. 1686) |
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| salvu troisi (b. 1892) |
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massimo troisi Italian actor, film director, and poet (1953–1994), IT (b. 1953) |
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| michele troisi Italian politician, IT (b. 1906) |
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| dante troisi Italian writer (1920-1989), IT (b. 1920) |
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rebecca troisi American cancer epidemiologist, US |
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licia troisi Italian writer, IT (b. 1980) |
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| lino troisi Italian actor (1932-1998), IT (b. 1932) |
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james troisi Australian association football player, AU (b. 1988) |
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| alfonso troisi Argentine former football striker, AR (b. 1954) |
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| enrico licciardi troisi Uruguayan writer, UY (b. 1961) |
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| roberta troisi Italian lawyer, IT (b. 1969) |
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| antonio troisi Italian astrophysicist, IT (b. 1973) |
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| roberto troisi (b. 1964) |
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| marcello troisi moreira Brazilian association football player, BR (b. 1976) |
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