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Cognomen Justo (Justo , Justu , جوستو ) , all around the world, is a widespread family name. The last name Justo is characteristic of Nicaragua, where it is a common surname, Spain, where it is quite a common surname, and Honduras (explore the name in all countries). Measured by absolute frequency, it is commonest in Mexico, Spain, and Brazil. Also, Justo is the forename as well as the last name.