Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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長野県 飯山市 小沼の名字

About 200 【田中】7
About 100 【大熊】6
About 80 【鈴木】7
About 60 【佐藤】7
About 50 【大日方】5
About 40 【高橋】7
About 40 【小林】7
About 30 【清水】7
About 20 【倉科】5
About 20 【篠原】6
About 20 【萩原】6
About 20 【大野】7
About 20 【藤沢】6
About 10 【足立】6
About 10 【兼子】5
About 10 【関】6
About 10 【西沢】6
About 10 【福沢】5
About 10 【藤澤】5
Very rare 【石田】7
Very rare 【伊藤】7
Very rare 【小出】6
Very rare 【大森】6
Very rare 【岡宮】4
Very rare 【岸田】6
Very rare 【島崎】6
Very rare 【滝沢】6
Very rare 【寺沢】6
Very rare 【常盤井】3
Very rare 【松浦】6