Dumingag, officially the Municipality of Dumingag, is a municipality in the province of Zamboanga del Sur, Philippines. According to the 2020 c…Dumingag, officially the Municipality of Dumingag, is a municipality in the province of Zamboanga del Sur, Philippines. According to the 2020 census, it has a population of 48,881 people. Local stories said it is named after a noted Subanen chieftain, "Dumi" and his wife, "Ingag". Another supposed origin of the name tells about the native fellow who was asked by a government agent as to what the name of the place was while watching a cockfight. After the game was over, the stranger inquired about the name of the place. The native curtly replied: "Duminag!" meaning "I won". The government agent misheard the word. Instead of "Duminag", he wrote down "Dumingag".