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Last name Saigo (Saigo , Сайго ) , throughout the world, is a rare family name. The family name Saigo is habitual in Romania, where it is a rare surname, Singapore, and Israel, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Philippines, Indonesia, and the United States. Also, Saigo is the forename as well as the last name.