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
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新潟県 上越市 上荒浜の名字

About 50 【笠原】6
About 10 【清水】7
About 10 【柳沢】6
Very rare 【木南】5
Very rare 【福田】7
Very rare 【柳澤】5