The surname Del Rosario is of Spanish origin and means "of the rosary". It is a patronymic surname, meaning that it was originally derived from the name of the father or ancestor of the bearer. In this case, the surname Del Rosario would have been given to someone whose father or ancestor was named Rosario. The name Rosario is itself derived from the Latin word "rosarium", which means "rose garden". It was originally used as a title for the Virgin Mary, who was often depicted holding a rosary. Over time, the name Rosario became a popular first name for both boys and girls in Spain and Portugal. It was also used as a surname, and eventually spread to other parts of the world, including the Philippines.