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Surname Riascos (Riascos ) , throughout the world, is a common family name. The last name Riascos is characteristic of Latin America and the Caribbean, particularly Colombia, where it is quite a common surname, Panama, where it is quite a rare surname, and Paraguay. In absolute terms, it is commonest in Colombia, the United States, and Venezuela. Much less frequently, Riascos is the forename as well as the last name.