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

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茨城県 常総市 山口の名字

About 60 【平間】5
About 30 【飯山】5
About 20 【飯田】6
About 20 【岡田】7
About 20 【風野】4
About 10 【関】6
About 10 【君山】4
About 10 【橋本】7
About 10 【山口】7
About 10 【石塚】6
About 10 【大原関】2
About 10 【大山】6
About 10 【笠原】6
About 10 【川田】6
About 10 【中島】7
About 10 【渡辺】7
Very rare 【青木】7
Very rare 【青柳】6
Very rare 【上野】6
Very rare 【東】6
Very rare 【飯塚】6
Very rare 【池田】7
Very rare 【岩渕】6
Very rare 【岩淵】5
Very rare 【大島】6
Very rare 【大幡】4
Very rare 【小倉】6
Very rare 【小島】7
Very rare 【河田】6
Very rare 【川向】5
Very rare 【菅原】6
Very rare 【吉川】6
Very rare 【吉野】6
Very rare 【木原】6
Very rare 【清水】7
Very rare 【近藤】7
Very rare 【草房】2
Very rare 【倉茂】4
Very rare 【倉持】6
Very rare 【栗原】6
Very rare 【高野】6
Very rare 【佐々木】7
Very rare 【佐藤】7
Very rare 【山野】6
Very rare 【下村】6
Very rare 【嶋崎】5
Very rare 【杉田】6
Very rare 【平川】6
Very rare 【高橋】7
Very rare 【高松】6
Very rare 【谷治】3
Very rare 【長塚】5
Very rare 【対崎】3
Very rare 【中村】7
Very rare 【中山】7
Very rare 【廣瀬】5
Very rare 【御園】5
Very rare 【宮崎】7
Very rare 【山崎】7
Very rare 【山中】6
Very rare 【吉原】6
Very rare 【淀川】5