Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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日本姓氏語源辞典 第三版
在日通名大全

日本初、在日通名の研究書「在日通名大全」発売中!
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青森県 弘前市 小沢広野の名字

About 300 【石岡】5
About 200 【下山】6
About 120 【山形】6
About 40 【今】6
About 30 【石山】6
About 30 【白浜】5
About 20 【井沢】5
About 20 【小野】7
About 20 【鳴海】5
About 10 【斎藤】7
About 10 【高橋】7
Very rare 【浅利】5
Very rare 【今井】7
Very rare 【宇野】6
Very rare 【小田桐】5
Very rare 【小田原】5
Very rare 【葛西】6
Very rare 【古山】5
Very rare 【佐伯】6
Very rare 【佐藤】7
Very rare 【澤田】6
Very rare 【諏訪】6
Very rare 【新内】4
Very rare 【鈴木】7
Very rare 【田沢】5
Very rare 【田中】7
Very rare 【中村】7
Very rare 【松本】7
Very rare 【三浦】7
Very rare 【宮本】7
Very rare 【渡辺】7