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Surname Deleon (Deleon , ديلون , Deleón ) , worldwide, is a common last name. The last name Deleon is habitual in Latin America and the Caribbean, particularly El Salvador, where it is quite a common surname, Guatemala, and Uruguay (explore the name in all countries). Measured by absolute frequency, the name is most common in the United States, Guatemala, and Philippines. Much less frequently, Deleon is the forename as well as the last name.