Okasaka 【岡坂】4 The Japanese surnames etymology dictionary.
Gunma-ken , Saitama-ken , Toukyou-to . Terrain . From the trees of the back. Gunma-ken Agatsuma-gun Higashi-ikatsuma-machi is based in the new volume. Tell him that he is the descendant of the fallen of Heike in the same place. 平 reference. Gunma-ken Agatsuma-gun Nakanojou-machi Tell her that she was engaged in agriculture and forestry in Orienta. Estimated in the Edo period.