Ichii 【檪】3 The Japanese surnames etymology dictionary.
Mie-ken , Chiba-ken , Shimane-ken . There is 井戸川 surname. Mie-ken Minamimuro-gun Kihou-chou Nogawa, Chiba-ken Noda-shi In the old cloth, Kagawa-ken Mitoyo-shi Yamamoto cho was in the Edo era in the western part of the West . Wakayama-ken Arida-gun Aridagawa-chou Itokawa (Itugawa) is a place name with a record since the Kamakura period. The place name was also written as "Yukawa". 井戸川 reference.