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Family name Hernadez (Hernadez ) , globally, is a common cognomen. The surname Hernadez is characteristic of Latin America and the Caribbean, particularly El Salvador, where it is quite a common surname, Guatemala, and the Dominican Republic. Measured by absolute frequency, it is the most numerous in Latin America and the Caribbean, particularly Mexico, Guatemala, and Colombia. Very seldom, Hernadez is the forename as well as the last name.