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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山形県 新庄市 十日町中川原の名字

About 80 【山科】5
About 30 【三原】6
About 20 【阿部】7
About 10 【今田】6
Very rare 【小倉】6