Cognomen 克己 (Keji 
, 克己 ) , in all the world, is quite a common last name. The surname 克己 is habitual in Nigeria, where it is quite a rare surname, Uganda, where it is a rare surname, and Sudan. In absolute terms, the name is most common in Nigeria, India, and China. Also, 克己 is the forename as well as the last name.
| 赤羽 克己 Japanese businessman, JP (b. 1869) |
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| 行徳 克己 Japanese businessperson (1927-2014), JP (b. 1927) |
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| 吉田 克己 JP (b. 1923) |
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| 南園 克己 JP (b. 1942) |
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