Cognomen Deferrari (Deferrari 
) , across the world, is a rare surname. The cognomen Deferrari is habitual in Uruguay, where it is quite a rare surname, Argentina, and Italy, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Argentina, the United States, and Brazil.
| VARIANT | COUNTRY |
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| Deferrari | Uruguay, Argentina, Brazil, Italy, United States |
| miguel deferrari Uruguayan writer, UY (b. 1948) |
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| amelia m. deferrari Argentine botanist |
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| graciela inés deferrari Dr. Universidad de Buenos Aires 1987 |
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| giacomo deferrari researcher |
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Mr, Katy, Paul, Raul, Rosa, Reus, Rick, Rita, Dany, Dino, Cory, Gary, Lisa, Luca, Luis, Luiz, Luna, Jose, John, Joao, Jean, Gina, Chas, Chad, Chai, Jo, Max, Ale, Ana, Pam, Dan, Luz, Jan, Joe, Joy, Mary, Mark, Mara, Maxx, Mike, Sole, Alex, Alma, Aldo, Anna, Aron, Juan, and Nick