The month of March in the Chamorro language is "Umatalaf," or "to catch guatafi," which is believed to be the root word of Umatac.

[1] Mount Bolanos, at an elevation of 368 m (1,207 ft), is the third highest peak of Guam and lies 4.5 km (2.8 mi) away.

Another explorer, Miguel López de Legazpi, arrived in Umatac in 1565 and claimed the island of Guam for Spain.

When Guam was colonized in the 17th century, the Spanish made Umatac a parish so the Chamorro people in the area could be converted to Christianity.

The F. Q. Sanchez Elementary School in Umatac has closed at the end of summer 2011 due to budget cuts.