The book, "Honcho Bugei Shoden" (Short Stories of Japanese Masters of Martial Arts), which was written in 1716 (seventy years after Musashi had died), says that Musashi's real name was 'Masana.'
武蔵死後71年目の『本朝武芸小伝』（1716年）で「政名」なる名が紹介された。