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 大日向平川原の名字

About 70 【山口】7
About 70 【小須田】5
About 50 【菊池】6
About 30 【由井】5
About 10 【坂本】7
Very rare 【新井】6
Very rare 【小宮山】5
Very rare 【細田】6
Very rare 【畠山】6
Very rare 【三井】6
Very rare 【横尾】6