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 東飛山の名字

About 70 【草間】5
About 60 【沢田】6
About 30 【前沢】5
About 20 【金子】7
Very rare 【関】6