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Surname Valerin (Valerin ) , across the world, is quite a rare last name. The surname Valerin is characteristic of Latin America and the Caribbean, particularly Costa Rica, where it is quite a common surname, Panama, where it is quite a rare surname, and Nicaragua, where it is a rare surname. Measured by absolute frequency, the name is most common in Costa Rica, Indonesia, and Italy. Much less frequently, Valerin is the forename as well as the last name.