Around the globe, Койи (Koji 
, Koyi 
, Койи 
) is a common gender-neutral first name. The forename Койи is habitual in Japan, where it is quite a rare boy's name, Hong Kong, where it is quite a rare unisex name, and Nigeria. In absolute terms, it is commonest in Japan, India, and Nigeria. Likewise, Койи is the last name as well as the forename.
Койи is also a name for the fictitious and mythical characters: Koji Segawa , the fictional character of Kamen Rider J; Kohji Haneda , the fictional character from Detective Conan; Koji Kabuto , the fictional character, Mazinger Z; Koji Makaino , character in Bakuman and Koji Hiraiwa , the character from Kuroko's Basketball, among other works.