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