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 上北郡七戸町 天間舘坪川原の名字

About 50 【金沢】6
Very rare 【金澤】5