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Last name コウイチロウ (Koichiro , Kouichirou , コウイチロウ ) , around the world, is a common cognomen. The family name コウイチロウ is characteristic of Japan, where it is quite a common surname, Israel, where it is a rare surname, and China, where it is a very rare surname. Very seldom, コウイチロウ is the forename as well as the last name.