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In all the world, コウイチ (Koichi , コウイチ , Kouichi ) is quite a rare boy's forename. The forename コウイチ is characteristic of Japan, where it is quite a rare masculine name, Chile, where it is a very rare masculine name, and Canada. Measured by absolute frequency, this name is the most popular in Japan, China, and the United States. More prevalently, コウイチ is the last name as well as the forename.
コウイチ is also a name for the fictitious and mythical characters: Kōichi Zenigata , the fictional human from Lupin III; Koichi Hirose , the character from the Japanese franchise JoJo's Bizarre Adventure; Kouichi Kimura , the character from Digimon; Koichi Kawahara , the character from Kuroko's Basketball and Koichi Hayama , the fictional character, Moonlight Lady.