Etymology and distribution of 洞口.

Horaguchi 【洞口】^{レベル5
About 3,600}  The Japanese surnames etymology dictionary.

Ibaraki-ken , Fukushima-ken , Tochigi-ken .

① Convention . Yuki's abbreviation. In Fukushima-ken Shirakawa-shi , I tell him that the descendant of Mr. Yuki who lived from the end of the Kamakura period abbreviated the thread bias of "Ku" and the soil bias of "Castle". Estimated in the Warring States Period. 結城 Yuuki reference.

② Tokushima-ken Tokushima-shi birth of Koshimachi Yoshinari. A place name with a record since the Kamakura period. It is distributed in the same place. Tokushima-ken Tokushima-shi Tokushima-machi castle inside was in the Edo period in the Tokushima Samurai of the Clan office.

③ Originated from Ooita-ken Bungotakada-shi Watari (old: Yoshinari name). A place name with a record in the Warring States Period. It was in the Sengoku period in the same place.

Dzuguchi 【洞口】^{レベル5
About 3,600}  The Japanese surnames etymology dictionary.

Oosaka-fu , Kyouto-fu · Fukuoka-ken . Oosaka-fu Izumisano-shi Kasuga-machi, Fukuoka-ken Tagawa-gun Ootou-machi It is distributed in the former hometown .

Douguchi 【洞口】^{レベル5
About 3,600}  The Japanese surnames etymology dictionary.

Ooita-ken Beppu-shi . Terrain . From the bridge. Ooita-ken Beppu-shi Distributed in Tsurumi.