Cognomen Cassai (Cassai 
) , across the world, is a rare surname. The cognomen Cassai is characteristic of Italy, where it is a rare surname, Australia, and Switzerland, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Italy, the United States, and Australia. Much less frequently, Cassai is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cassai | Italy, Australia, Switzerland, United States, France |
| tessa salvina cassai (born 1963) (b. 1963) |
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| alessandro de cassai researcher ORCID 0000-0002-9773-1832 |
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| paolo cassai author of Biblioteche oggi |
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Max, Carlo, Carla, Bruno, Paolo, Primo, Piero, Rocio, Denis, Laura, Larry, Leasa, Livia, Lucia, Luisa, Janay, Nancy, Noemi, Nello, Nea-Bc, Elisa, Fabio, Anita, Alice, Marco, Maria, Bea, Mary, Mark, Sara, Aldo, Anna, Clay, Paul, Rosa, Gary, Frank, Gino, Luca, Jack, Josh, John, Tara, Toni, Nick, Enzo, Faye, Fede, Lisa, and Firma