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Family name Del Rosario (Del Rosario ) , across the world, is a widespread surname. The family name Del Rosario is characteristic of Philippines, where it is a common surname, Guam, where it is quite a common surname, and the Dominican Republic (explore the name in all countries). Measured by absolute frequency, the name is most common in Philippines, the Dominican Republic, and Mexico. Much less frequently, Del Rosario is the forename as well as the last name.