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Cognomen Castrejon (Castrejon , Кастрехон ) , across the world, is a common last name. The surname Castrejon is characteristic of Latin America and the Caribbean, particularly Mexico, where it is quite a common surname, Peru, and Panama. Measured by absolute frequency, it is the most numerous in Mexico, Peru, and the United States. Much less frequently, Castrejon is the forename as well as the last name.