Surname ケンイチ (Kenichi 
, ケンイチ , Ken'Ichi ) , all around the world, is a common last name. The surname ケンイチ is characteristic of Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Singapore, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, ケンイチ is the forename as well as the last name.
| 小椋ケンイチ Japanese hairdresser, JP (b. 1968) |
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| ヨシムラ ケンイチ Japanese film actor, JP (b. 1974) |
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| 青田ケンイチ Japanese singer-songwriter, JP (b. 1978) |
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| 兵庫ケンイチ Japanese singer, JP (b. 1979) |
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