Surname Tranquilli (Tranquilli 
) , in the world, is quite a rare cognomen. The surname Tranquilli is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Sweden. Measured by absolute frequency, the name is most common in Italy, the United States, and Brazil. Much less frequently, Tranquilli is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tranquilli | Sweden, Italy, United States, Argentina, Brazil |
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giovanni tranquilli IT (b. 1827) |
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| giuseppe tranquilli italian composer, IT (b. 1820) |
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silvano tranquilli Italian actor, IT (b. 1925) |
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nico tranquilli Italian software developer and founder of Terremoto and Earthquake apps, IT |
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| adrian tranquilli Australian visual artist, AU (b. 1966) |
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| andrew tranquilli Australian rules footballer (b. 1972) |
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| allison tranquilli basketball player, AU (b. 1972) |
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| valentina tranquilli Italian business executive |
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| stefania tranquilli researcher |
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| giulia tranquilli researcher (ORCID 0000-0001-6236-3681) |
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| francesca tranquilli Italian business executive |
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| vittorio tranquilli (b. 1970) |
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| andrea tranquilli Italian rower, IT (b. 1986) |
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| antonio tranquilli |
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| sabrina tranquilli Italian lawyer, IT (b. 1990) |
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Mr, Bill, Bice, Kyle, Paul, Raul, Rosa, Rick, Rita, Rudy, Brad, Gian, Lara, Leda, Luca, Luis, Luiz, Jane, Jose, John, Jean, Gigi, Cira, Cara, Adua, Ms, Sue, Ana, Ann, Ada, Bob, Kim, Ron, Rex, Lia, Joe, Joy, Mary, Mark, Matt, Meri, Sara, Aldo, Anna, Anne, Adam, Juan, and Tony