「Kosaku, Furusaku」(こさく / ふるさく)さんの名字の由来、語源、分布。

① Nagasaki-ken Matsuura-shi Birth of Shisa - cho litigation. Use the place name of the place name. It is based in the same place.

② Creation . "Yuan" was added to the village which is the surname of the Kamoshima-ken Amami archipelago. Estimated at the time of returning to Japan in 1953. Kagoshima-ken Ooshima-gun Setouchi-chou There is distribution in Nishikara . Where she in the 里 there last name. 里 Sato reference.

2021年 7月 27日更新

2018年 9月 30日更新

Whole Japan		Prefectures
レベル	3	1　Chiba-ken(About 200) 2　Toukyou-to(About 50) 3　Saitama-ken(About 30) 4　Kanagawa-ken(About 20) 5　Oosaka-fu(About 10) 6　Shizuoka-ken(About 10) 6　Kyouto-fu(About 10) 8　Kagoshima-ken(Very rare) 8　Okayama-ken(Very rare) 8　Miyagi-ken(Very rare)
Population	About 300
Ranking	16,272

Rank by city
1　Sousa-shi(About 60) 2　Funabashi-shi(About 30) 3　Sanmu-shi(About 30) 4　Kasukabe-shi(About 10) 4　Tougane-shi(About 10) 6　Kawasaki-shi Saiwai-ku(About 10) 6　Hamamatsu-shi(About 10) 6　Edogawa-ku(About 10) 6　Asahi-shi(About 10) 6　Sanbu-gun Shibayama-machi(About 10)

Rank by subregion
1　千葉県匝瑳市米倉(About 20) 2　千葉県山武市蓮沼(About 10) 2　千葉県山武市（その他）(About 10) 2　千葉県匝瑳市野手(About 10) 5　神奈川県川崎市幸区北加瀬(About 10) 5　千葉県匝瑳市上出羽(About 10) 5　埼玉県春日部市藤塚(About 10) 5　千葉県富里市十倉(About 10) 5　千葉県旭市高生(About 10)