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Globally, Koichi (Koichi , コウイチ , 浩一 , among others...) is quite a rare male given name. The given name Koichi is habitual in Japan, where it is quite a rare masculine name, Chile, where it is a very rare masculine name, and Canada. Not in comparison with a country's population, this name is the most popular in Japan, China, and the United States. More prevalently, Koichi is the last name as well as the forename.
Koichi is also a name for the fictitious and mythical characters: Koichi Hirose , the character from the Japanese franchise JoJo's Bizarre Adventure; Koichi Hayama , the fictional character, Moonlight Lady; Koichi Kawahara , the character from Kuroko's Basketball and Kōichi Zenigata , the fictional human from Lupin III.