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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長野県 南佐久郡佐久穂町 大日向下川原の名字

About 70 【坪井】6
About 30 【高見沢】5
About 30 【小須田】5
About 10 【原】7
Very rare 【池田】7
Very rare 【栗林】6
Very rare 【畠山】6