Because the natives of this farming and fishing village had progressively clung to the fertile lowland soil and fish- rich meandering rivers and creeks in the central part of the province, its people earned the benevolence and recognition of Bishop Francisco Gainza, O.P.

It was named after the late bishop of Nueva Caceres, Francisco Gainza of the Dominican Order.

Domingo for the construction of a canal or passageway originally planned by two Franciscan Friars and by Governor Norzagaray as early as the first half of the 17th Century.

The canal was to serve two purposes: one to connect the river of Naga to the sea of Pasacao which would shorten the route from Naga City to Manila avoiding the treacherous San Bernardino Strait, and the other is to serve as another outlet for the flood waters of the lower plains of the province.

The barangays are: Gainza borders Milaor to the south, Pamplona to the west, Canaman to the north, Camaligan and Naga City to the east.

[3] Poverty Incidence of Gainza Source: Philippine Statistics Authority[10][11][12][13][14][15][16][17] Majority of the land is devoted to rice, vegetables and other root crops.

These bridges, along with a connecting road linking to its nearby municipality will improve transportation options, making it easier for residents and travelers to move between these areas.