Cognomen Cosi (Cosi 
) , in all the world, is quite a common family name. The family name Cosi is habitual in Peru, where it is quite a rare surname, Italy, and Switzerland. Measured by absolute frequency, the name is most common in Italy, India, and Peru. Much less frequently, Cosi is the forename as well as the last name.
| eligio pietro cosi Roman Catholic bishop (b. 1819) |
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| lando cosi IT (b. 1924) |
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| liliana cosi IT (b. 1941) |
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| giovanni cosi Italian philosopher, IT (b. 1951) |
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| dario m. cosi (b. 1949) |
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| luca cosi Italian hurdler (b. 1963) |
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| elisabetta cosi researcher |
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| franco cosi researcher |
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| sandra cosi researcher |
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| carlo cosi librettist |
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| valerio cosi Italian musician, IT (b. 1985) |
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| carolina cosi Italian association football player, IT (b. 1996) |
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| julián cosi Argentine footballer, AR (b. 1998) |
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| andrea cosi |
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