Ogaya 【大鋸谷】3 The Japanese surnames etymology dictionary.
Hiroshima-ken Ootake-shi · Kyouto-fu · Shizuoka-ken . Hiroshima-ken Ootake-shi Originated from the Oto Valley of Kokata. In the vicinity of the same place say that he was called "Oborodani" on the land where Heike's lost person lived after the battle of Dannoura which was in Yamaguchi-ken Shimonoseki-shi in 1185 (2 years old year and 4 years old). 平 reference.