Etymology and distribution of 國道.

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

Hiroshima-ken , Okayama-ken , Ooita-ken .

① Topography . From the mountain on the left. Ooita-ken Beppu-shi It was in the Edo era in the eastern Ishigaki and Ishigaki.

② Topography . Tottori-ken Sakaiminato-shi Takeuchi Town tells that in the Edo period the branch of Yamamoto surname was called "from left" and from Yamamoto "mountain". 山本 Yamamoto reference.