Surname Gaiani (Gaiani 
) , in all the world, is quite a rare cognomen. The cognomen Gaiani is characteristic of Italy, where it is quite a rare surname, Serbia, where it is a rare surname, and Switzerland. In absolute terms, it is the most numerous in Italy, France, and Brazil. Very seldom, Gaiani is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gaiani | Italy, Serbia, Argentina, France, Brazil |
| giovanni battista gaiani (b. 1757) |
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| egisto gaiani (b. 1832) |
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luigi gaiani Italian politician (1910-2003), IT (b. 1910) |
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| werther gaiani Italian association football player (1925-1944), IT (b. 1925) |
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| marco gaiani Italian civil engineer (1960-), IT (b. 1960) |
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| gianandrea gaiani IT (b. 1963) |
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| claire gaiani researcher (b. 1977) |
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| marco antonio gaiani Venezuelan entomologist, VE |
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| federica gaiani researcher |
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| lorenzo gaiani |
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Mr, Nico, Elda, Eros, Evet, Ezio, Frã, Ivan, Maria, Mario, Marta, Marco, Mauro, Mabel, Mirko, Sarah, Sonia, Sofia, Alice, Alana, Andre, Aailton, Joao, Joan, Jose, Jack, Ms, Max, Ale, Ana, Art, Eli, Marc, Sara, Alex, Alan, Carlo, Aldo, Anne, Aida, Rosa, Rose, Remo, Gian, Lara, Leia, Lino, Luca, Anna, and Carla