Sachisuke, grandson of Tamesuke, bore the name of SUWABE, whose descendant was hired as a manager and lord of manor in the Mitoya-go district in Iiishi-gun County of Izumo Province and moved to Izumo, and took the placename Mitoya as his family name, which was considered to be the beginning of the Mitoya clan.
為扶の孫幸扶は諏訪部幸扶と名乗り、その子孫が出雲国飯石郡の三刀屋郷の地頭職を得て出雲に入り、地名の三刀屋を名字としたことが三刀屋氏の始まりとされる。