Surname Giustiniani (Giustiniani 
) , in the world, is quite a rare last name. The cognomen Giustiniani is characteristic of Italy, where it is quite a rare surname, Switzerland, where it is a rare surname, and France. In absolute terms, it is the most numerous in Italy, France, and the United States. Very seldom, Giustiniani is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giustiniani | France, Argentina, Italy, United States, Switzerland |
Giustinian, Giustiniano, and Гиустиниани
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francesco giustiniani garibaldo Genoese doge, IT (b. 1336) |
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lorenzo giustiniani first Patriarch of Venice, IT (b. 1381) |
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| pietro recanelli giustiniani (b. 1350) |
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| andreolo giustiniani Italian antiquarian seller and writer, GR (b. 1385) |
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| giustiniani eufemia IT (b. 1408) |
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| giovanni giustiniani Genoese captain and soldier (15th century), IT (b. 1418) |
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paolo giustiniani priest, IT (b. 1476) |
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| bartolomeo giustiniani IT (b. 1435) |
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paolo giustiniani moneglia politician, IT (b. 1506) |
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| bricio giustiniani (b. 1450) |
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giovanni giustiniani GR (b. 1501) |
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| agostino giustiniani Italian bishop and academic, IT (b. 1470) |
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| tommaso giustiniani (b. 1477) |
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giovanni agostino giustiniani campi doge of the Republic of Genoa, IT (b. 1538) |
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| timoteo giustiniani Roman Catholic bishop (b. 1502) |
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Mr, Rita, Dean, Dino, Gary, Gaia, Gian, Gina, Gino, Gigi, Rich, Lina, Lori, Luca, Luis, Jack, John, Jean, Juan, Judy, Tony, Lilo, Remi, Rosa, Paul, Amy, Ben, Kay, Lia, Luc, Joe, Eve, Eva, Marc, Mary, Mara, Matt, Maud, Sara, Sila, Alex, Aldo, Anna, Anne, Asia, Ciro, Tone, and Tina