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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千葉県 香取郡東庄町 大友の名字

About 80 【飯田】6
About 20 【河連】3
Very rare 【菅谷】6