Family name Giustiniano (Giustiniano 
) , all over the world, is a rare surname. The surname Giustiniano is habitual in Italy, where it is a rare surname, Australia, where it is a very rare surname, and Argentina. Measured by absolute frequency, this name is the most popular in Italy, the United States, and Australia. Likewise, Giustiniano is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giustiniano | Italy, Australia, United States, Argentina, Venezuela |
Giustiniani, Iustinian, Justinian, and Justynian
| bernardo giustiniano Roman Catholic bishop (b. 1574) |
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| nicola giustiniano Italian ceramist (1732-1815), IT (b. 1732) |
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| guido giustiniano Italian theologian and jurist, IT (b. 1941) |
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| luca giustiniano researcher ORCID ID = 0000-0002-3044-6535 |
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| enrico giustiniano researcher |
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| francesco giustiniano researcher ORCID ID = 0000-0001-9277-8538 |
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| domenico giustiniano researcher ORCID ID = 0000-0003-3136-4176 |
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| mariateresa giustiniano researcher (ORCID 0000-0002-6856-414X) |
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| mariano giustiniano Argentinian volleyball player, AR (b. 1986) |
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| pompeo giustiniano |
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| san giustiniano |
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