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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秋田県 北秋田市 桂瀬槇ノ沢の名字

About 30 【金沢】6
About 10 【槙沢】3
Very rare 【石崎】6
Very rare 【山口】7