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Cognomen Kosuke (Kosuke , Косуке , Косукэ) , in the world, is a rare last name. The family name Kosuke is characteristic of Singapore, where it is a rare surname, Japan, and Indonesia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in China, Japan, and Indonesia. More frequently, Kosuke is the forename as well as the last name.