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Cognomen Fidelis (Fidel , Fidelis , Feal ) , across the world, is a widespread last name. The surname Fidelis is habitual in Mexico, where it is quite a common surname, Spain, and Nigeria (explore the name in all countries). Not in comparison with a country's population, the name is most common in Mexico, Nigeria, and Brazil. Likewise, Fidelis is the forename as well as the last name.