Cognomen Gagliardo (Gagliardo 
) , globally, is quite a common last name. The last name Gagliardo is habitual in Italy, where it is quite a rare surname, Argentina, and Switzerland, where it is a rare surname. In absolute terms, it is the most numerous in Italy, the United States, and Argentina. Much less frequently, Gagliardo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gagliardo | Switzerland, Italy, Brazil, United States, Argentina |
| giovanni battista gagliardo Italian abbot, economist and agronomist (1758-1823) (b. 1757) |
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ruth gagliardo American advocate for library services, US (b. 1895) |
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giovanna gagliardo Film director, Screenwriter, IT (b. 1943) |
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| elena gagliardo author (20th century) (b. 1901) |
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| alberto helios gagliardo IT (b. 1893) |
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tulio gagliardo Argentinian opera conductor, AR (b. 1965) |
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gastón gagliardo Ecuadorian politician, EC (b. 1967) |
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| emilio gagliardo Italian mathematician, IT (b. 1930) |
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| john g. gagliardo John G. Gagliardo, Boston Univ, US (b. 1933) |
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maximiliano gagliardo Argentine footballer, AR (b. 1983) |
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| anna licia gagliardo Italian italianist and poetess (1935-), IT (b. 1935) |
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| antonio gagliardo Ecuadorian politician, EC (b. 1943) |
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| giorgio gagliardo IT (b. 1966) |
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| filippo gagliardo Italian basketball player, IT (b. 1978) |
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| gagliardo primario Italian architect and sculptor, IT |
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