Across the world, Letterio (Letterio 
) is quite a rare masculine first name. The first name Letterio is characteristic of Italy, where it is quite a rare masculine name, Argentina, where it is a very rare masculine name, and France. Measured by absolute frequency, the name is most common in Italy, the United States, and Argentina. Very seldom, Letterio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Letterio | Canada, Argentina, France, Italy, United States |
| letterio subba Italian sculptor (1787-1868), IT (b. 1787) |
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| letterio turchi Roman Catholic bishop (1789-1861) (b. 1789) |
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letterio d'arrigo ramondini Roman Catholic archbishop, IT (b. 1849) |
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| letterio lizio bruno IT (b. 1837) |
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letterio calapai American artist, US (b. 1902) |
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letterio la spada Italian politician (1911-1971), IT (b. 1911) |
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| letterio savoja Italian engineer, IT (b. 1873) |
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| letterio di francia 1877--1940; Francia, Letterio di (b. 1877) |
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| letterio catapano Italian footballer, IT (b. 1902) |
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| letterio cucinotta Italian racing driver, IT (b. 1902) |
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| letterio toscano Italian mathematician (1905-1977) (b. 1905) |
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| letterio scalia (b. 1908) |
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| letterio briguglio Italian historian (1921-2016), IT (b. 1921) |
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| letterio augliera author (1948-) (b. 1948) |
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| letterio mauro (b. 1948) |
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Luca, Bombaci, Pirrone, Dizione, Gemelli, Villari, Frisone, Morabito, Minutoli, Silipigni, Sorrenti, Cardullo, Calarese, Briguglio, D'Arrigo, Galletta, Lombardo, Marmorino, Cucinotta, Guglielmo, Santamaria, Sanfilippo, Bonanno, Barbera, Ciraolo, Calabro, Arena, Amato, Costa, Curro, Rando, Romeo, Rizzo, Russo, Delia, Gatto, Scopelliti, Oliva, Caruso, Parisi, Donato, Lagana, Irrera, Zahami, Mangano, Salmeri, Scoglio, Campolo, Oteri, and De Domenico