Itabayashi 【板林】3 The Japanese surnames etymology dictionary.
Gifu-ken Nakatsugawa-shi . Originating from Niigata-ken Itoigawa-shi . Place name with a record since the North / South morning era. There is a place where it is said that the place name was developed by Mr. Itoi and it was called "Itoi-so". 糸井 reference. Gifu-ken Nakatsugawa-shi Takayama tells that it was called Itoigawa surname in 1469 to 1487 (civilized year). Gifu-ken Nakatsugawa -shi Estimated from tradition in the Nakatsugawa river in the late Heian and early Kamakura period. Gifu-ken Nakatsugawa-shi Saplings were in the Edo period. Gifu - ken Nakatsugawa - shi Komaba, Gifu - ken Nakatsugawa - shi Sakashita says that it changed from Itoigawa 's surname at Meiji New surname.