Cognomen Tonassi (Tonassi 
) , around the world, is a rare surname. The cognomen Tonassi is habitual in Brazil, where it is a rare surname, Italy, where it is a very rare surname, and Switzerland. In absolute terms, it is the most numerous in Brazil, Italy, and Germany. Very seldom, Tonassi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tonassi | Germany, Italy, Brazil, Switzerland, China |
| pietro tonassi Italian composer, violinist, cellist and conductor, IT (b. 1800) |
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| timo tonassi DE |
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Mr, Iris, Ilka, Ilca, Ivan, Igor, Yago, Maria, Mario, Marco, Marli, Marly, Selma, Sonia, Alice, Aline, Andre, Agnes, Carla, Carol, Celio, Clara, Ines, Edna, Eder, Nilo, Ms, Sã, Ana, Ary, Rã, Ely, Eni, Ivy, Mara, Alex, Bruno, Anna, Roni, Rita, Luiz, Jane, Jair, Jose, Joao, Joel, Theo, Thor, Ateu, and Bruna