Kempo and kenpo are the same art. They use the same kanji. However, when written in kana (Japanese syllabery), the nasal 'n' is pronounced as 'm' whe...

Kempo and kenpo are the same art. They use the same kanji. However, when written in kana (Japanese syllabery), the nasal ‘n’ is pronounced as ‘m’ when before a ‘b’ or ‘p’ sound. EG, when written as nba, it is pronounced mba, and if written npa, it is pronounced mpa. He probably called it kempo because he didn’t know written Japanese, but officially in kana it is kenpoo/kenpou pronounced kempoo/kempou. Hope I helped.

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