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 三条市 大谷地の名字

About 60 【小柳】6
About 50 【金子】7
About 30 【坂井】6
About 30 【日下部】5
About 20 【富沢】5
About 10 【小林】7
About 10 【山崎】7
About 10 【小池】6
Very rare 【吉田】7