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Last name Minamoto (源 , Minamoto ) , around the globe, is a common family name. The surname Minamoto is habitual in Eastern Asia, particularly China, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Japan. Not in comparison with a country's population, it is commonest in China, Indonesia, and Japan. More prevalently, Minamoto is the forename as well as the last name.