The people who first inhabited Ambil were from the island of Lubang. They chose to build houses in one part of this small island where a kind of bamboo, known in the Tagalog dialect as tambo, grew abundantly. When the number of families increased in this part of the island, they called their settlement as Sitio Tambo. Later on, another sitio appeared in another part of Ambil. The people who settled there called it as Sitio Tabaw.
Reference: HISTORY OF LOOC by Rudy Candelario. Translated in English by Benjamin Walata. (http://sites.google.com/site/occidentalmindorohistory/historylooc)