Cognomen Fonio (Fonio 
) , all around the world, is a rare surname. The family name Fonio is habitual in Italy, where it is a rare surname, Croatia, and Argentina, where it is a very rare surname. Measured by absolute frequency, it is commonest in Italy, Argentina, and France. Very seldom, Fonio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fonio | Italy, France, United States, Argentina, Croatia |
| anton christian fonio (1881-1968), CH (b. 1881) |
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| dezider fonio Victim of the Holocaust, DE (b. 1896) |
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| paolo fonio researcher |
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| maria angela fonio correspondence chess player |
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| ehud fonio researcher |
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| clement fonio |
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| giovanni fonio Italian tennis player (b. 1998) |
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Ana, Julio, Tammy, Terry, Elena, Italo, Oscar, Wilma, Marina, Martin, Matteo, Matias, Silvia, Soraya, Soraia, Sofía, Angela, Angelo, Blanca, Katina, Raquel, Debora, Lucia, Licia, Laura, Guido, Don, Mary, Anna, Raul, Ryan, Luca, Erik, Ezio, Ehud, Maria, Gianni, Marie, Marta, Marco, Annie, Carlo, Carol, Kevin, Paola, Paolo, Desil, Donna, Mario, and Gloria