San Esteban, officially the Municipality of San Esteban, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census…San Esteban, officially the Municipality of San Esteban, is a municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 8,381 people. The Spaniards named the pueblo San Esteban purportedly in relation to reports they received about a vagabond named Iban having been stoned to death and beheaded by hostile natives in the place called "Naglawlawayan," which is an early place of worship by the natives and currently the site of the municipal cemetery. "Iban" is the Ilocano equivalent of "Stephen," hence the pueblo being named San Esteban.