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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秋田県 山本郡三種町 下岩川小町の名字

About 120 【近藤】7
About 20 【小山内】5
Very rare 【板倉】6
Very rare 【高森】5