Cognomen Quaini (Quaini 
) , in all the world, is quite a rare surname. The surname Quaini is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Italy, Argentina, and Brazil. Very seldom, Quaini is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Quaini | Australia, Italy, Brazil, Argentina, France |
| francesco quaini Italian painter (1611-1680), IT (b. 1611) |
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| luigi quaini Italian painter (1643-1717), IT (b. 1643) |
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giovanni quaini IT (b. 1880) |
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| massimo quaini Italian geographer and historian of cartography (1941-2017), IT (b. 1941) |
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| guillermo quaini Argentinian volleyball player, AR (b. 1971) |
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| annalisa quaini Ph.D. École Polytechnique Fédérale de Lausanne 2009 |
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| annalisa quaini researcher (ORCID 0000-0001-9686-9058) |
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| maria quaini mezzosoprano |
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| federico quaini researcher |
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| eugenio quaini |
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| alessandro quaini association football player, IT (b. 1998) |
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Mr, Edio, Ezio, Hugo, Ilda, Igor, Olga, Omar, Maria, Mario, Marta, Marco, Maisa, Mauro, Maura, Mirta, Mirko, Sueli, Sonia, Aline, Anita, Ariel, Elma, Elsa, Nora, Tami, Ms, Max, Ana, Eva, Sara, Anna, Aida, Atty, Ayla, Paul, Airto, Raul, Rene, Riga, Rudy, Dora, Gian, Luca, Luiz, Jose, Joao, Juan, Rosa, and Carlo