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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新潟県 上越市 栗沢の名字

About 30 【安原】5
About 20 【長藤】4
About 10 【川上】6
About 10 【藤野】6