Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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新潟県 妙高市 両善寺の名字

About 130 【丸山】7
About 90 【小島】7
About 80 【安原】5
About 20 【小嶋】6
About 10 【吉崎】6
About 10 【水野】6
About 10 【宮崎】7
About 10 【宮沢】6
Very rare 【小山】6
Very rare 【矢坂】4