Komai 【駒井】5 The Japanese surnames etymology dictionary.
Kyouto-fu , Oosaka-fu , Hyougo-ken . Terrain . 坂根 's variant. Kyouto - fu Fukuchiyama - shi Since Ino It was a vassal of Genji who is a warrior of the Heian period, tell him that he changed his name at the Meiji New surname when he called Sakane surname. In Hokkaidou Wakkanai-shi , Shimane-ken Eastern (formerly Izumo-nation) comes out and tells that it was renamed from Sakane surname at Meiji New surname.