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In all the world, 浩一 (Koichi , 浩一 , Kōichi) is quite a rare boy's given name. The first name 浩一 is characteristic of Japan, where it is quite a rare boy's name, Chile, where it is a very rare boy's name, and Canada. Not in comparison with a country's population, the name is most common in Japan, China, and the United States. Also, 浩一 is the last name as well as the forename.
浩一 is also a name for the fictitious and mythical characters: Kōichi Zenigata , the fictional human from Lupin III; Kōichi Sakuranomiya , the fictional character from Blend S; Koichi Hirose , the character from the Japanese franchise JoJo's Bizarre Adventure; Koichi Kawahara , the character from Kuroko's Basketball and Koichi Hayama , the fictional character, Moonlight Lady.