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 花巻市 江曽第5地割の名字

About 80 【大原】6
About 40 【柳原】6
About 10 【小瀬川】4
About 10 【佐々木】7
Very rare 【岩瀬】6
Very rare 【吉田】7
Very rare 【武田】7
Very rare 【中村】7