Etymology and distribution of 二岩.

Futaiwa 【二岩】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Miyazaki-ken Miyakonojou-shi . Creation . Miyazaki-ken Miyakonojou-shi From the cheap door of the gate division system in the sewage town in the Edo period. The gate name comes from the favorable character "An".

※ Ehime-ken Kamiukena-gun Kumakougen-chou It was during the Warring States period as a vassal of Mr. Ohno who was the castle owner of Sugo's exceptional castle.