Malalag derives its name from the color that describes the river running within the heart of the town. The natives referring to the river called it, “malalag nga tubig”, meaning “yellow water.” The distinct appearance of the river attracted migrants to the place. Some pioneers trace the town's name from a disagreement between a Spanish soldier and Datu Alag, a famous chieftain among the early trib
es. It was said that Datu Alag made an appointment with the Spaniard and promised him to be his guide. However, Datu Alag broke his promise and not one of his followers could tell where he has gone. Sensing that he had somehow been tricked, the Spanish soldier became enraged and shouted, “Mal Alag, Mal Alag.” (Bad Alag!) The tribe members confounded by his words kept on repeating it. The same story was told over the generations, so that even settlers coming from Visayas and Luzon became accustomed to calling the place Malalag. Malalag Bay was previously known as Casilaran Bay, The name Malalag was applied to it some time during the Second World War after a Philippine National Police (PNP) barracks was established. The same area, now known as Crossing Baybay and adjacent to the 434th PNP Mobile Force Company barrack, was a center of commerce with Chinese traders. Also, the Malalag Wharf that is located about a kilometer away used to accommodate three to four sea vessels that loaded products for transport to Visayas. Malalag became a municipality by virtue of Executive Order No. 596 dated May 28, 1953 issued by H.E. This legal document stated that Malalag shall comprise the southern and south-eastern part of Padada and separated from its mother municipality of Padada by a straight west-to-east line passing through the Bolton Barrio Boundary Monument No. 20, Sta. Cruz Cadastre 275 Davao. Its boundary on the South was redefined under Republic Act 1008 stating among others that the boundary line between the municipalities of Padada and Malalag shall be from east to west of Balasinon River from the Gulf of Davao to Km. 327 of the Digos-Malalag-Makar Road and a straight line along latitude 6°36' from the provinces of Davao and Cotabato. Even upon the creation of Sulop pursuant to Executive Order 295, the Padada-Malalag boundary as defined in R.A. 1008 was reiterated. For two decades, the boundary dispute arising from the encroachment of the Municipality of Sulop into the territory of Malalag remained unsettled. Originally, Malalag contained the Poblacion that is the seat of the Municipal Government, Bulacan, Bolton, Sta. Maria, New Baclayon and Sulop. At present, it has fifteen (15) regular barangays: Poblacion, Baybay, Bulacan, Bolton, New Baclayon, Caputian, Bagumbayan, Ibo, Pitu, Tagansule, Kiblagon, Rizal, San Isidro, Mabini and Lapu-lapu. The Municipality used to celebrate "Araw ng Malalag" every 2nd day of July, but by virtue of Municipal Ordinance No. 10 dated May 21, 1990, and consistent with its charter day, the celebration was transferred to May 28. On July 2, 1953, the first sets of local officials were appointed and assumed office, headed by Mayor Col. Antonio Lanzar.
