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 十和田市 深持山ノ下の名字

About 200 【中野渡】5
About 10 【古谷】6
About 10 【下久保】4
Very rare 【久保】6
Very rare 【畠山】6
Very rare 【松岡】6
Very rare 【松田】7