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 妙高市 兼俣の名字

About 30 【曽根原】5
About 20 【清水】7
About 20 【後藤】7
Very rare 【荒井】6
Very rare 【小川】7
Very rare 【坪井】6