Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
https://play.google.com/store/apps/details?id=info.jigensha.jcedfreeGoogle Play で手に入れよう https://apps.apple.com/us/app/id1471109324
↑オフライン検索できるアプリもどうぞ

新潟県 上越市 上田島の名字

About 110 【古沢】6
About 30 【篠原】6
About 30 【保坂】6
About 20 【丸山】7
About 20 【清水】7
About 10 【古澤】5
Very rare 【吉原】6