Background
He is the scion of MINAMOTO clan (SEIWA GENJI: Yamana branch); his farther's official family name is YAMANA (the historically-succeeded surname is MINAMOTO or MINAMOTO-NO-ASON).
His great-grandfather is Koshichi Iwata who was a co-founder of the DAIDO LIFE INSURANCE COMPANY, Japan (also a founder of Shinsyu life insurance company and a founder of Asahi life insurance company). His grandfather is Mosaburo Makita who was a founder of MAKITA CORPORATION (one of the world-wide electric machine companies), Japan.