Nakahisa 【中久】3 The Japanese surnames etymology dictionary.
Kagoshima-ken , Fukuoka-ken , Kumamoto-ken . Terrain . A variant of 原口 . From the spring mouth gate of the gate division system which was in the Edo period. An example of the location of the gate. Miyazaki-ken Ebino-shi Nagayama, Miyazaki-ken Ebino-shi Tohoku. Kagoshima-ken Minamisatsuma-shi Kaneda Uchiyamada, Kagoshima-ken Aira-shi Haraguchi gate in Higashi - gingoda. In Kagoshima-ken Aira-shi Higashi - gingoda, the gate was also written as "spring mouth". Fukuoka-ken Tachibana-cho Tachibana-cho Yamebama-gun (Simohebal) is a place name with a record since the Edo period. It is based in the same place. 原口 reference.