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 大日向古谷の名字

About 70 【由井】5
About 30 【小須田】5
About 20 【平岡】6
About 10 【工藤】7
About 10 【高見沢】5
Very rare 【市川】6
Very rare 【大塚】6
Very rare 【大林】6
Very rare 【荻原】6
Very rare 【佐塚】4
Very rare 【三石】5
Very rare 【坪井】6
Very rare 【所付】2
Very rare 【百瀬】5
Very rare 【山腰】5