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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.