Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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新潟県 妙高市 長沢の名字

About 200 【大野】7
About 70 【白井】6
About 50 【金沢】6
About 40 【飯塚】6
About 40 【鴨井】5
About 40 【西条】5
About 20 【久保田】6
About 20 【千葉】6
About 10 【小島】7
About 10 【吉沢】6
Very rare 【上野】6
Very rare 【阿部】7
Very rare 【大塚】6
Very rare 【金澤】5
Very rare 【吉田】7
Very rare 【佐藤】7
Very rare 【樗沢】3
Very rare 【丸山】7
Very rare 【村松】6
Very rare 【桃井】5