Cognomen Cassello (Cassello 
) , in the world, is a rare last name. The surname Cassello is characteristic of the United States, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Very seldom, Cassello is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cassello | United Kingdom, United States, Canada |
| kathleen cassello American operatic soprano, US (b. 1958) |
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| jackie cassello American gymnast, US (b. 1966) |
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