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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宮城県 登米市 横山前田沢の名字

About 20 【亀井】6
About 20 【菊地】6
About 10 【遠藤】7
Very rare 【古川】6
Very rare 【佐藤】7