Etymology and distribution of 岩河内.

Iwakouchi 【岩河内】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Hyougo-ken , Yamaguchi-ken , Kagoshima-ken .

① Personal name . Tell him that Mr. Sasaki of the descendant of Emperor Uta, the emperor of the Heian period, called Shiga-ken Kouka-shi (formerly Koka-gun) called it. 佐々木 Sasaki reference.

② Birth of Kouchi-ken Kounan-shi Akaoka Town (formerly Matsubara of Utah). A place name with a record in the Heian period.

Iwagouchi 【岩河内】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

烏田 Karasuda reference.