Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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青森県 十和田市 奥瀬生内の名字

About 30 【外山】6
About 20 【赤崎】5
About 20 【小笠原】6
About 10 【赤坂】6
About 10 【中村】7
Very rare 【市ノ渡】3
Very rare 【小沢】6
Very rare 【折田】5
Very rare 【斉藤】7
Very rare 【関】6
Very rare 【中川】7
Very rare 【福沢】5