The name Arellano was honor of its most illustrious native, Cayetano Arellano, the first Justice of the Supreme Court (1901-1913). Arellano, a Barangay in the town proper of Orion. It was one of the populated residential areas composing the old Poblacion. Prior to its recognition as a regular Barangay , the community was then known as Barangay de Hipolito Dela Cruz, in honor of the Cabeza de Barangay of the place. Mayor Francisco Urquisa, the sixth mayor of Orion, initiated the creationof Arellano into a regular Barangay in 1915 to answer the call of the creation of new Barangays in the Province, Barangay Hipolito Dela Cruz, later known as Tangaran, was changed to Arellano.