Kōichi

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"
• 孝市, "filial piety, market"

The name can also be written in hiragana (こういち) or katakana (コウイチ).

• Kohichi Amano (天野 浩一, born 1979), Japanese baseball player
• Koichi Chigira (孝一, born 1959), Japanese anime director
• Koichi Domoto (born 1979), Japanese performing artist
• Kōichi Fukaura, Japanese shogi player
• Koichi Fukuda (born 1975), Japanese musician
• Koichi Iida ((飯田 鴻一, 1888–1973), Japanese businessman
• Kouichi Inoue (井上 幸一, born 1946), Japanese golfer
• 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 Kinoshita (木下 浩一, born 1967), Japanese shogi player
• Kōichi Kitamura (1931–2007), Japanese voice actor
• Kōichi Mashimo (born 1952), Japanese anime director
• Koichi Miyano (宮野 洪一, born 1942), Japanese rower
• Koichi Mizushima (born 1965), Japanese gymnast
• Kōichi Morishita (森下 広一, born 1967), Japanese long-distance runner
• Koichi Morita (army officer)
• Koichi Morita (songwriter)
• Koichi Murata (村田 航一, born 1996), Japanese footballer
• Koichi Nakamura (中村 光一, born 1964), Japanese video game designer
• Koichi Nakano (中野 浩一, born 1955), former professional racing cyclist and ten-consecutive-time world champion in track cycling sprint
• Koichi Nishimura (born 1973), Japanese volleyball player
• Koichi Omura (大村 皓一, born 1938), Japanese computer animator
• Koichi Ono (小野 光一, 1919–2000), Japanese golfer
• Kōichi Sakaguchi (坂口　候一, born 1968), Japanese voice actor
• Kōichi Satō (actor) (佐藤 浩市, born 1960), Japanese actor
• Koichi Sato (biathlete) (佐藤 幸一, born 1956), Japanese biathlete
• Koichi Sato (footballer) (佐藤 洸一, born 1986), Japanese footballer
• Koichi Sato (philatelist) (佐藤 浩一), Japanese philatelist
• Koichi Sato (ski jumper) (佐藤 耕一, born 1931), Japanese ski jumper
• Koichi Shoji (庄司浩一, 1955–2019), Japanese murderer
• Koichi Sugawara (菅原 貢一, born 1950), Japanese bobsledder
• Koichi Sugiyama (こういち; birth name 浩一, born 1931), Japanese video game composer
• Kōichi Tabuchi (田淵 幸一, born 1946), Japanese baseball player and manager
• Koichi Tanaka (born 1959), Japanese Nobel Prize winner in chemistry
• Koichi Togashi (冨樫 剛一, born 1971), Japanese footballer and manager
• 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
• Amakaze Kōichi (天風 浩一, born 1991), Japanese sumo wrestler

• 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 Hirose (広瀬康一), a character from the manga and anime series JoJo's Bizarre Adventure
• 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 Kizakura, a character from the anime Danganronpa 3: The End of Hope's Peak High School
• Koichi Haimawari, a character from the manga Boku no Hero Academia
• Koichi Adachi, a character and main party member from the videogame Yakuza: Like a Dragon