Namesakes
Nobel Prize Winners:
1 chemistry
(chemistry) Koichi Tanaka 2002 
Olympic Medalists:
2 bronze, 2 silver
(bronze) Koichi Hirakida 1960 swimming - 4x100 m medley relay
(bronze) Koichi Oshima 1992 baseball
(silver) Kōichi Morishita 1992 marathon
(silver) Koichi Misawa 1996 baseball