Kōyō, Koyo or Kouyou is a masculine Japanese given name. Notable people with the name include:Kōyō Aoyagi , Japanese baseball player Kōyō Ishikawa , Japanese photographer Kōyō Kawanishi , Japanese astronomer Musashimaru Kōyō , American sumo wrestler Kōyō Okada , Japanese photographer Ozaki Kōyō , Japanese writer Koyo Sato , Japanese footballer
