Okui 【奥居】4 The Japanese surnames etymology dictionary.
① Convention . The abbreviation for the bottom gate. Kyouto-fu Kyoutango-shi In Tango town, I tell him that descendants of Shimotsudobu Dalian (Shimoto Beno Omuraji), who was a follower of Impero Muko, the royal family of the Asuka period, called. Downtown Department, Downtown Department Dalian is unknown whether it exists.
③ Kagoshima-ken Shibushi-shi Originated from Shimotsudo (Saget) of the Ariake Town Nomura. There was Shitodate residence of the gate division system in the Edo period in the same place. The surname also is Sage.