Etymology and distribution of 坂口.

Sakaguchi 【坂口】^{レベル6
About 95,000}  The Japanese surnames etymology dictionary.

Yamagata-ken .

① Fukushima-ken Futaba-gun Near the Naraha-machi (formerly Shiratado) is a place name with a record in the Heian era. Most of Ibaraki-ken is Hakuta. Ibaraki-ken Tsuchiura-shi Central was in the Edo period in the Tsuchiura clan of the clan government.

② Abstract . Abbreviation for Hatakeyama. In Ishikawa-ken northern part (formerly Noto-ku), tell him that you disassembled Hatakeyama's "Hatakeya" and disguised it. Estimated in the Azuchi Momoyama period. 畠山 Hatakeyama reference.

③ Kumamoto-ken Ashikita-gun Ashikita-machi Origin of Shiraki. A place name with a record since the Edo period. I used Shiraki's "White". It is distributed in the same place.

④ Korea type . Terrain . Add "rice" to white. Toukyou-to Bunkyou-ku has a record of naturalization on April 27, 1961. The real name is white. 白 Haku reference.