「Koga」(こが)さんの名字の由来、語源、分布。

Hokkaidou , Oosaka-fu , Nagasaki-ken . Terrain . From bamboo and rice fields. In Okayama-ken Takahashi-shi tell Kyouto-fu Kyouto-shi it was called from the Heian era. Oosaka-fu Eastern (formerly: Kawachi country) to the north and south morning era, Nagasaki-Ken Shimabara-Shi castle is the clan Agency Shimabara samurai, Nagasaki-Ken Hirado-Shi rock town of Han Agency Hirado samurai, Tokushima-Ken Tokushima-Shi , It was in the Edo period in Ehime-ken Seiyo-shi . Tokushima-ken Mima-gun Tsurugi-chou Tell the Sadako River that it is Meiji New surname . Mie-ken Inabe-shi Tell him that he was engaged in agriculture at Iikura in Kita-cho. Estimated in the Edo period.

2022年 5月 11日更新

Whole Japan		Prefectures
レベル	3	1　Shiga-ken(About 80) 2　Toukyou-to(About 40) 3　Kanagawa-ken(About 30) 3　Aichi-ken(About 30) 5　Ooita-ken(About 20) 6　Okayama-ken(About 10) 6　Oosaka-fu(About 10) 6　Kyouto-fu(About 10) 9　Shizuoka-ken(About 10) 9　Nagasaki-ken(About 10)
Population	About 300
Ranking	16,564

Rank by city
1　Takashima-shi(About 70) 2　Setagaya-ku(About 10) 2　Machida-shi(About 10) 2　Ooita-shi(About 10) 5　Yokohama-shi Kouhoku-ku(About 10) 5　Nagasaki-shi(About 10) 5　Nagoya-shi Chikusa-ku(About 10) 5　Beppu-shi(About 10) 5　Sapporo-shi Higashi-ku(About 10) 10　Hamada-shi(Very rare)

Rank by subregion
1　滋賀県高島市大供(About 60) 2　北海道札幌市東区東苗穂十二条(About 10) 2　滋賀県高島市今津(About 10) 2　神奈川県横浜市港北区富士塚(About 10) 2　大分県大分市市(About 10) 2　東京都町田市金井町(About 10)