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Surname Kenichi (Kenichi , ケンイチ , 研一 ) , all over the world, is a common last name. The last name Kenichi is habitual in 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 commonest in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, Kenichi is the forename as well as the last name.