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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福島県 双葉郡富岡町 本岡赤木の名字

About 70 【横田】6
About 20 【飯高】5
About 10 【掛田】4
About 10 【北崎】5
About 10 【大川】6
Very rare 【大和田】6
Very rare 【斎藤】7
Very rare 【杉内】5
Very rare 【林】7