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Surname リョウスケ (Ryosuke , リョウスケ , Ryousuke ) , in all the world, is a common last name. The cognomen リョウスケ is characteristic of Japan, where it is quite a common surname, Malaysia, where it is a very rare surname, and Indonesia. Measured by absolute frequency, it is commonest in Japan, China, and Indonesia. Very seldom, リョウスケ is the forename as well as the last name.