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Surname Fidelia (Fidelia , Fidélia , Фиделия ) , in the entire world, is a common last name. The last name Fidelia is habitual in Latin America and the Caribbean, particularly Mexico, where it is quite a common surname, Nicaragua, and Honduras (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Nigeria, Mexico, and Indonesia. Also, Fidelia is the forename as well as the last name.