Bais, officially the City of Bais, is a 3rd class component city in the province of Negros Oriental, Philippines. According to the 2020 census, it has a population of 84,317 people. In the early days of Spanish exploration, some Spaniards came upon a swampy land and docked their boats at the vicinity of the two small islets that guarded the village. W…Bais, officially the City of Bais, is a 3rd class component city in the province of Negros Oriental, Philippines. According to the 2020 census, it has a population of 84,317 people. In the early days of Spanish exploration, some Spaniards came upon a swampy land and docked their boats at the vicinity of the two small islets that guarded the village. While exploring the place, they saw natives fishing along the coast. The Spaniards approached the natives and asked for the name of the place. The natives could not understand Spanish, and believing that the Spaniards were asking for the name of their catch, the natives answered saying "Ba-is"; from that day on, this swampy valley of the Old Panlabangan and Talamban Hills became known as Bais.