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Last name Sinto (Sinto , สินโต ) , all over the world, is quite a rare family name. The cognomen Sinto is habitual in Guatemala, where it is quite a rare surname, Philippines, and South Africa, where it is a rare surname. Not in comparison with a country's population, the name is most common in Philippines, Indonesia, and Guatemala. Also, Sinto is the forename as well as the last name.