Etymology and distribution of 保路.

Hoji 【保路】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Oosaka-fu , Nara-ken Yoshino-gun Ooyodo-chou . Terrain . Oosaka-fu tells that the surroundings of the place of residence were valleys, so that the field of surnames of the youngster was changed to "valley" and renamed. Estimated in the Edo period. 弓場 Yumiba reference.