Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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長野県 諏訪市 豊田上野の名字

About 80 【笠原】6
About 60 【平林】6
About 20 【宮下】6
Very rare 【飯田】6
Very rare 【塩田】6
Very rare 【中島】7
Very rare 【福岳】3