Ooshiba 【大芝】4 The Japanese surnames etymology dictionary.
② Topography . From the Okuya gate of the gate division system that was in the Edo period. An example of the location of the gate. Kagoshima-ken Aira-shi Sumiyoshi. Kagoshima-ken Satsumasendai-shi Okuyama gate in Miyazato-cho. The gate name comes from the back house of the back.