Etymology and distribution of 門ノ口.

Kadonokuchi 【門ノ口】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hyougo-ken , Hiroshima-ken , Okayama-ken . Last name including "river", 藤原 surname. Gifu-ken Nakatsugawa-shi seedlings were in the Edo period in the Sapling Samurai of the Clan office. 藤原 Fujiwara reference.