Family name Cainelli (Cainelli 
) , all over the world, is quite a rare last name. The cognomen Cainelli is habitual in Italy, where it is a rare surname, Argentina, and Romania. In absolute terms, it is the most numerous in Brazil, Italy, and Argentina. Much less frequently, Cainelli is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cainelli | Romania, Argentina, Italy, Brazil, Switzerland |
| carlo cainelli Italian engraver and painter, IT (b. 1896) |
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| adelino cainelli politician from Brazil, BR (b. 1951) |
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| elmar cainelli politician from Brazil, BR (b. 1957) |
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| giulio cainelli (born 1959) (b. 1959) |
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| francesca cainelli researcher |
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| elisa cainelli researcher (ORCID 0000-0002-5039-4680) |
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Mr, Rene, Rita, Rian, Rute, Davi, Dora, Lais, Leno, Leda, Lina, Lino, Luca, Luis, Luiz, Luan, Jane, Jose, Joao, Joã, Jean, Juan, Rosa, Raul, Karl, Braz, Ms, Mel, Mã, Sue, Ana, Ary, Rui, Leo, Eva, Ivo, Tamy, Ida, Mary, Mica, Sara, Seba, Alex, Aldo, Anna, Abel, Adao, Axel, Mari, and Tati