Kōichi Mashimo
Kōichi Nakano
Kōichi Saitō
Kōichi Tōhei
Kōichi Toyama
Kōichi Satō
Koichi Domoto
Kōichi Wakata
Kōichi Okada
Kōichi Chigira
Kōichi Itagaki
Kōichi Kishi
Kōichi Hayashida
Kōichi Sugiyama
Kōichi Sugiyama (football)
Kōichi Morita (compositeur)
Kōichi Yamamoto
Kobayashi Koichi
Kōichi Tanaka
Kōichi Miura
Koichi Fukaura
Kōichi Hagiuda
Kōichi Tani
Kōichi Ishii
Kōichi Nakamura
Kōichi Kido
Kōichi Yamadera
Koichi Kawai (1886-1955)
Kōichi Morishita
Koichi Fukuda
Koichi Wajima
Koichi Hashiratani
Koichi Misawa
Koichi Kudo
Koichi Zenigata
Koichi Oita
Koichi Kawai
(14445) Koichi
Koichi Muramatsu
Kōichi Isoda
Kōichi Taira
Kōichi Saitō (photographe)
Fujii Kōichi
Kōichi Shiozawa
Kōichi Saitō (réalisateur)
Kōichi Imaizumi