Ichijou 【一定】2 The Japanese surnames etymology dictionary.
① Originated from the vicinity of Fukushima-ken Kawanuma-gun Aidzubange-machi (formerly Inagawa-so). In the Kamakura period the name of a place with a record in the notation "Ninhe River". The place name was also written as "Inawa" and "Inawa".
③ Topography . Added "river" to the rice which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. Kagoshima-ken Ooshima-gun Isen-chou There is distribution on the horse . Where she in 稲 There surname. 稲 reference.