The Japanese surnames etymology dictionary.
Shizuoka-ken , Nagasaki-ken . Gunma-ken Fujioka-shi Onishi is a place name with a record since the Sengoku period. The place name was also written as "Oishi". Gunma-ken Takasaki-shi It was during the Warring States period as a vassal of Mr. Nagano who was the castle owner of Minowa castle in Minoucho cho.