Ambaguio, officially the Municipality of Ambaguio, is a municipality in the province of Nueva Vizcaya, Philippines. According to the 2020 censu…Ambaguio, officially the Municipality of Ambaguio, is a municipality in the province of Nueva Vizcaya, Philippines. According to the 2020 census, it has a population of 15,472 people. The name "ambaguio" was from the word "bagiw," meaning "moss" which covered every inch of trees and stones in the area. The inhabitants were called "e-am-bagiw" meaning "conqueror of moss." The name underwent a series of changes due to its difficult pronunciation by the lowland people who later settled in the area and to differentiate the town from the more famous City which also had the same etymology, resulting in the present "Ambaguio."