Last name Quadrio (Quadrio 
) , throughout the world, is a rare cognomen. The last name Quadrio is characteristic of Italy, where it is a rare surname, Australia, and Portugal. Measured by absolute frequency, it is the most numerous in Italy, Australia, and Argentina. Very seldom, Quadrio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Quadrio | Australia, France, Argentina, Portugal, Italy |
| stefano quadrio Italian condottiero, IT (b. 1376) |
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| gerolamo quadrio Swiss-Italian architect, IT (b. 1625) |
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francesco saverio quadrio Italian scholar (1695-1756), IT (b. 1695) |
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| giovanni battista quadrio IT (b. 1659) |
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| giuseppe maria quadrio (b. 1707) |
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maurizio quadrio (1800-1876) Italian patriot, IT (b. 1800) |
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| emilio quadrio IT (b. 1858) |
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| quadrio pirani IT (b. 1878) |
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| assunto quadrio Italian psychologist, IT (b. 1929) |
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| giuseppe quadrio (b. 1921) |
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| milvia quadrio CH (b. 1936) |
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| lanfranco quadrio (b. 1966) |
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| isabelle quadrio researcher ORCID ID = 0000-0001-6867-8238 |
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| giacomo antonio quadrio Italian artist (active 1735) |
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| mandy quadrio Australian artist |
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Mr, Ivan, Olga, Maria, Marie, Mario, Marta, Marco, Marli, Mauro, Sandy, Shane, Shony, Susan, Sonia, Steve, Anita, Aaron, Chris, Brian, Bruno, Karen, Irma, Iris, Ines, Elsa, Ms, Ana, Kim, Guy, Jay, Joe, Tim, Ola, Zac, Zaq, Katie, Mary, Mick, Alan, Kyle, Rick, Doug, Lois, Luca, Luis, Jose, Juan, Mark, and Kayla