Etymology and distribution of 崗本.

Okamoto 【崗本】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Akita-ken Nikaho-shi , Oosaka-fu · Hiroshima-ken . Distribution that also includes mimicry. A variant of 下井 . Shiga-ken Hikone-shi Kaname Town was in the Edo period in the Hikone san of the clan office. In estimation, I changed the name "Ii" of Mr. Ii, who was the same lord, as a farewell to the early Edo period. 下井 Shimoi reference.