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Family name Cecilio (Cecilio , ססיליו , Caecilius) , all around the world, is a common cognomen. The family name Cecilio is habitual in U.S. Virgin Islands, where it is quite a common surname, Mexico, and Spain (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Mexico, Spain, and Brazil. Also, Cecilio is the forename as well as the last name.