Throughout the world, Koji (Koji 
, コウジ , كوجي 
, among others...) is a common epicene given name. The first name Koji is characteristic of Japan, where it is quite a rare masculine name, Nigeria, where it is a rare dominantly male, but infrequently feminine name, and Hong Kong, where it is a rare male name. Measured by absolute frequency, it is the most numerous in Japan, India, and Nigeria. More frequently, Koji is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Koji | Japan, China, Nigeria, United States, India |
| コウジ | Japan |
| كوجي | Saudi Arabia, Sudan, Egypt, Libya, Iraq |
| Кодзи | Russia |
Ikoji, Kodi, Kohji, Koj, Komichi, Komiti, Kooji, Koro, Kosuji, Kouji, Kozi, Kōji, Odi, Oji, Omichi, Omiti, Onoji, Oro, Ozi, Shoji, Shōji, Syohji, Syoji, Syouji, Койи, Коро, Наката, Оро, كوج, كوجى, كوچى, コジ, 伊藤, 光二, 光司, 光治, 功治, 孝二, 孝司, 孝治, 宏二, 宏治, 小池, 小路, 岸尾, 康二, 康治, 恒二, 晃司, 浩二,
Koji is also a name for the fictitious and mythical characters: Koji Segawa , the fictional character of Kamen Rider J; Koji Kabuto , the fictional character, Mazinger Z; Koji Makaino , character in Bakuman; Koji Hiraiwa , the character from Kuroko's Basketball and Koji Kobori , the character from Kuroko's Basketball, among other works.
| koji aozuka (b. 1885) |
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| koji yano botanist (b. 1912) |
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| koji ariyoshi American activist, US (b. 1914) |
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koji hirano Japanese photographer and artist (b. 1968) |
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| koji nozawa botanist (b. 1925) |
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| koji ito botanist (1931-2014) (b. 1931) |
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koji morita JP (b. 1972) |
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| koji ogura Japanese-Dutch artist (b. 1933) |
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| koji kamoji Japanese artist, PL (b. 1935) |
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| koji hosokawa (b. 1928) |
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| koji tanaka badminton player, JP (b. 1940) |
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| koji takamatsu (b. 1930) |
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| koji hirabayashi Canadian wrestler (b. 1942) |
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| koji takaki (b. 1933) |
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| koji iwagami Japanese artist (born 1951), JP (b. 1951) |
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