Kotabe 【古田部】3 The Japanese surnames etymology dictionary.
② Personal name . From Hei Mihira of the warlords of the Heian period and the Kamakura period. Okayama-ken In Kume-gun Misaki-chou tell the descendant of the Heike's vassal who was defeated in the fight of Ichinotani in 1184 (8 years of juniors and 3 years of senba) at Hyougo-ken Koube-shi . 土肥 reference.