Last name Quarto (Quarto 
, Quartus 
) , worldwide, is quite a rare cognomen. The cognomen Quarto is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Belgium. Not in comparison with a country's population, the name is most common in Italy, the United States, and Argentina. Also, Quarto is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Quarto | Italy, Indonesia, Philippines, United States, Argentina |
| Quartus | Indonesia, Canada, Brazil, United States, South Africa |
Carto, Cuarto, Quartarolo, and Quartino
| girolamo quarto author (16th century) (b. 1501) |
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quarto trabacchini Italian politician, IT (b. 1949) |
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| quarto pianesi Italian hockey player, IT (b. 1940) |
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| licurgo nunes quarto person identified in the Museu da Pessoa collection, BR (b. 1948) |
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| célio lúcio da costa quarto Brazilian association football player, BR (b. 1971) |
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| mariangela quarto researcher (ORCID 0000-0002-5048-2314) |
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| aimeric de quarto bishop of the Roman Catholic Church |
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| michele quarto researcher |
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| rodolfo quarto researcher |
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| francesco quarto author of Accademie & biblioteche d'Italia, IT |
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| frank quarto college basketball player (1958–1959) Manhattan |
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| italo quarto |
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| blanche polyxena de quarto |
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