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Family name Casiano (Casiano , كاسيانو) , in the entire world, is a common surname. The cognomen Casiano is habitual in Latin America and the Caribbean, particularly Puerto Rico, where it is quite a common surname, Mexico, and Bolivia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Mexico, Philippines, and the United States. Very seldom, Casiano is the forename as well as the last name.