There's another theory about his birth, saying that he was the same person as Kanzaburo, a grandson of Ukon NAKAMURA who was the youngest brother of Kazuuji NAKAMURA, but it is uncertain.
また、出自の異説として中村一氏の末弟・中村右近の孫の勘三郎と同一人物であるという説もあるが、定かでは無い。