Cognomen Masi (Masi 
, ماسي 
, Мази 
, among others...) , in the entire world, is a common surname. The cognomen Masi is characteristic of San Marino, where it is a common surname, Fiji, where it is quite a common surname, and Paraguay (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Italy, Pakistan, and India. Very seldom, Masi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Masi | Paraguay, Italy, Pakistan, United States, India |
| ماسي | Iraq, Egypt, Sudan, Saudi Arabia, Algeria |
| Мази | Kazakhstan, Russia, Ukraine, Kyrgyzstan |
| Масі | Ukraine |
| マシ | Japan |
| bartolomeo masi Italian writer, FR (b. 1480) |
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| cosimo masi (b. 1537) |
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| giulio masi 17th-century Catholic bishop, IT (b. 1570) |
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| giovan battista masi (b. 1574) |
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| alessandro masi Roman Catholic bishop (b. 1586) |
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luigi masi Italian politician (1814-1872), IT (b. 1814) |
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| pietro masi Italian brigand (1801-1871), IT (b. 1801) |
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| seraphim masi (b. 1797) |
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| raffaele masi Italian priest and literary (1817-1876), IT (b. 1817) |
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| giuseppe masi Roman Catholic bishop (1826-1903) (b. 1826) |
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| giorgio masi politician (1836-1915), IT (b. 1836) |
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| ernesto masi Italian historian, IT (b. 1836) |
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| maddalena mariani masi opera singer, FR (b. 1850) |
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| saverio masi Italian politician (1855-1910), IT (b. 1855) |
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| francesco masi (b. 1852) |
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