Cognomen Giustini (Giustini 
) , in the world, is quite a rare last name. The surname Giustini is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Ireland. Measured by absolute frequency, it is commonest in Italy, Argentina, and the United States. Very seldom, Giustini is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giustini | Italy, United States, Argentina, Canada, France |
| lodovico giustini Italian composer, IT (b. 1685) |
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filippo giustini Catholic cardinal, IT (b. 1852) |
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| guglielmo giustini Roman Catholic bishop (b. 1846) |
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carlo giustini Italian actor, IT (b. 1923) |
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pietro alessandro giustini IT (b. 1939) |
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| luciano giustini IT (b. 1951) |
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| niki giustini Italian actor (1964-2017), IT (b. 1964) |
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| daniela giustini author of Biblioteche oggi |
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| mauro giustini researcher |
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| francesca giustini researcher |
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| sandra giustini researcher ORCID ID = 0000-0001-7034-3816 |
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| lucio giustini researcher |
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| dean giustini researcher |
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| viviana giustini researcher |
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| marco giustini researcher |
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