Kōichi or Koichi or Kouichi (こういち, コウイチ) is a common masculine Japanese given name.
Kōichi can be written using different kanji characters and can mean:
晃一, "clear, one"
幸一, "happiness, one"
光一, "light, one"
孝一, "filial piety, one"
弘一, "vast, one"
浩一, "abundance, one"
宏一, "wide, one"
耕一, "cultivate, one"
The name can also be written in hiragana (こういち) or katakana (コウイチ).
Koichi Chigira (孝一, born 1959), Japanese anime director
Koichi Domoto (born 1979), Japanese performing artist
Koichi Fukuda (born 1975), Japanese musician
Koichi Ishii (浩一, born 1964), Japanese game designer
Koichi Kato (LDP) (born 1939), Japanese politician
Koichi Kato (DPJ) (born 1964), Japanese politician
Koichi Kawakita (born 1942), Japanese special effects artist
Kōichi Kido (1889–1977), Lord Keeper of the Privy Seal of Japan during World War II
Kōichi Kitamura (1931–2007), Japanese voice actor
Kōichi Mashimo (born 1952), Japanese anime director
Koichi Morita (army officer)
Koichi Morita (songwriter)
Koichi Nishimura (born 1973), Japanese volleyball player
Koichi Sugiyama (こういち; birth name 浩一, born 1931), Japanese video game composer
Koichi Tanaka (born 1959), Japanese Nobel Prize winner in chemistry
Koichi Tohei (born 1920), Japanese aikido practitioner
Kōichi Tokita (born 1961), Japanese manga artist
Kōichi Tōchika (born 1971), Japanese voice actor
Koichi Wakata (born 1963), Japanese astronaut
Kōichi Yamadera (born 1961), Japanese voice actor
Koichi Kobayashi (born 1952), Japanese Go player
Koichi Morishita (born 1967), Japanese long-distance runner
Kouichi Kimura, from the TV series Digimon Frontier
Koichi Shido, from manga/anime Highschool of the Dead
Kouichi Hayase, from manga/anime Linebarrels of Iron
Koichi Zenigata, from Lupin III
Koichi Hayama, from adult anime/game Moonlight Lady
Koichi Hiramoto, from Wangan Midnight
Koichi Kijima, from Wangan Midnight
Kōichi Tanemura, a character from the anime/manga Hanasaku Iroha
Kōichi Sakakibara, the main protagonist of the series Another
Koichi Hirose, a character from the manga JoJo's Bizarre Adventure.
