Ken'ichimJapanese From Japanese 健 (ken) meaning "healthy, strong" or 研 (ken) meaning "study, sharpen" combined with 一 (ichi) meaning "one". Other kanji combinations are possible.
KenjimJapanese From Japanese 健 (ken) meaning "healthy, strong" or 研 (ken) meaning "study, sharpen" combined with 二 (ji) meaning "two". This name can also be formed from other combinations of kanji characters.
OsamumJapanese From Japanese 修 (osamu) meaning "discipline, study", as well as other kanji that have the same pronunciation.