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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岩手県 奥州市 真城中平の名字

About 30 【小田原】5
About 20 【浅利】5
Very rare 【及川】6
Very rare 【北島】6
Very rare 【佐々木】7