Surname Defina (Defina 
) , in the entire world, is quite a rare last name. The family name Defina is habitual in Italy, where it is a rare surname, Australia, and Argentina. In absolute terms, it is commonest in Italy, the United States, and Indonesia. Also, Defina is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Defina | Indonesia, Italy, United States, Argentina, Democratic Republic of the Congo |
| antônio francisco defina person identified in the Museu da Pessoa collection, BR (b. 1916) |
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| stephanie defina American tennis player, US (b. 1946) |
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| andrea defina author (1956-) (b. 1956) |
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