The Japanese surnames etymology dictionary.
Yamaguchi-ken Hagi-shi . Terrain . From the upper territory. Yamaguchi-ken Hagi-shi Horiuchi was in the Edo period in the Choshu clan medicine of the clan office. The doctor in charge tells that he was renamed from Yoshimi surname due to the upper rank of Aichi - ken Chiryuu - shi Yahashi - machi by the warfare of 1374 (7 years of revival, 3 years in sentence). 吉見 reference. There is also a story that he came to Shimane-ken west (formerly Iwami-kun) to 1381 (first year of Eikoku and Hirokazu first year) and named the place name as upper, middle and lower territory. Shimane-ken Kanoashi-gun Yoshika-chou (formerly Kamakura ) is a place name with a record since the Muromachi Period.