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Cognomen コウタロウ (Koutarou , コウタロウ , Kotarou ) , all over the world, is a common surname. The last name コウタロウ is habitual in Eastern Asia, particularly Japan, where it is quite a common surname, and China, where it is an extremely rare surname. Much less frequently, コウタロウ is the forename as well as the last name.