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 上越市 岩神の名字

About 200 【飯田】6
About 20 【井上】7
About 10 【大滝】6
About 10 【渡辺】7
Very rare 【佐々木】7
Very rare 【難波】6
Very rare 【浜屋】4
Very rare 【横尾】6