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Family name 良一 (Liangyi , Ryoichi , 良一 ) , in the world, is quite a rare cognomen. The last name 良一 is characteristic of Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Cambodia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Japan, China, and Indonesia. More prevalently, 良一 is the forename as well as the last name.