Last name Gagliardi (Gagliardi 
) , across the world, is a common cognomen. The family name Gagliardi is habitual in Italy, where it is quite a common surname, Argentina, where it is quite a rare surname, and Uruguay. Measured by absolute frequency, it most frequently occurs in Italy, the United States, and Argentina. Much less frequently, Gagliardi is the forename as well as the last name.
| achille gagliardi Italian philosopher and theologian, IT (b. 1537) |
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| filippo gagliardi Italian painter (1606-1659), IT (b. 1606) |
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| bernardino gagliardi Italian painter (1609-1660), IT (b. 1609) |
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| domenico gagliardi Italian physician, writer and philosopher, IT (b. 1660) |
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| giulio antonio gagliardi (b. 1660) |
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| paolo gagliardi IT (b. 1675) |
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| rosario gagliardi Italian architect, IT (b. 1698) |
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| nicola gagliardi Roman Catholic bishop (b. 1708) |
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| carlo gagliardi bishop of Muro Locano 1767-1778, IT (b. 1710) |
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pietro gagliardi 19th-century Italian painter, IT (b. 1809) |
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| luigi gagliardi Roman Catholic bishop (b. 1786) |
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| dionisio pagliani gagliardi (b. 1801) |
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| giuseppe gagliardi botanist (1812-1881) (b. 1812) |
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| raffaele gagliardi Italian theologian, IT (b. 1814) |
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| enrico gagliardi Italian politician, IT (b. 1820) |
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