Wikipedia
Mangubat an old Tagalog and Visayan word that means "to battle or combat".
according to Ifugao Tuwali language Mangubat refers to those who war against a group of people or country.
It is mentioned in Antonio de Morga's 1609 book Sucesos de las islas Filipinas:
These Visayans are a race less inclined to agriculture, and are skilful in navigation, and eager for war and raids for pillage and booty, which they call "mangubat". This means "to go out for plunder."Mangubat ( Mang-gubat) ( Spanish: Guerrear); is a Filipino surname of Mactan Island origin which means "to wage war" or "to fight". It belongs to a noble lineage according to Vicente de Cadenas y Vicent. The last Cronista Rey de Armas appointed by the Spanish Ministry of Justice.
The Mangubat surname were members of the hidalgo class of Spain that had an azure shield, with a vertical gold pike or pica, and stick. Mangubat when related to a name, it usually means marauders and warriors in the Visayas.
Antonio de Morga, in his book published in 1609 Sucesos de las Islas Filipinas, mentions that the term means "to go to war and raid for plunder". the term was also used by Francisco Baltazar (1778–1862) in his 1838 book Florante at Laura to means "to go for battle". The term is derived from two Filipino words – the verb mang (to do) and the noun gubat ( war). "Gubat" is a common word for war in the language of the Visayans,the ancient Tagalog, the Ilocano people, the Igorot people, in Mindanao, and in the Autonomous Region in Muslim Mindanao.