Namesakes
Koichi Tanaka
(m) 1959- 
Nobel Prize Winners 2002 (chemistry)
Kōichi Morishita
(m) 1967-
Olympic Medalists 1992 marathon (silver)
Koichi Hirakida
(m) 1938-1993
Olympic Medalists 1960 swimming - 4x100 m medley relay (bronze)
Koichi Misawa
(m) 1974-
Olympic Medalists 1996 baseball (silver)
Koichi Oshima
(m) 1967-
Olympic Medalists 1992 baseball (bronze)