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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青森県 つがる市 上古川花森の名字

About 70 【小関】6
About 70 【柴谷】5
About 30 【古坂】4
About 30 【石岡】5
About 10 【高橋】7
About 10 【箱田】5
Very rare 【新谷】6
Very rare 【境谷】4
Very rare 【三上】6
Very rare 【山谷】5
Very rare 【対馬】5
Very rare 【福井】6
Very rare 【三浦】7