Cognomen Hernáez (Hernáez 
) , globally, is a very rare surname. The family name Hernáez is habitual in Spain, where it is a rare surname, Chile, where it is an extremely rare surname, and Argentina. Very seldom, Hernáez is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hernáez | Argentina, United States, Chile, Spain |
| francisco javier hernáez (1816-1876), ES (b. 1816) |
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kasilda hernáez ES (b. 1914) |
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julio hernáez hernáez Spanish kyokushin, ES (b. 1954) |
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| luis hernáez (b. 1947) |
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| constancio hernáez Spanish composer (born 1957), ES (b. 1957) |
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| patricio hernáez researcher |
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| manuel higueras hernáez Ph.D. Universitat Autònoma de Barcelona 2015 |
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| josu hernáez Spanish footballer, ES (b. 1985) |
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| inmaculada hernáez |
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| olga rivera hernáez |
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Mª, Manuel, Miguel, Sergio, Andrea, Carlos, Carmen, César, Blanca, Paloma, Ramón, Raquel, Rubén, Lucila, Javier, Joseba, Jesús, Felipe, Ismael, Iñaki, Mariano, Shirley, María, Marina, Irene, Judit, Ana, Alba, Adol, Beto, Luis, Jose, Juan, Inma, Maria, Marta, Alfredo, Sergi, Pablo, Pedro, Pilar, Raúl, David, Diego, Laura, José, Jorge, Julio, Sonia, and Antonio