Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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静岡県 菊川市 小沢の名字

About 50 【福島】6
About 30 【永田】6
Very rare 【下川】6
Very rare 【進士】5
Very rare 【杉山】7
Very rare 【鈴木】7
Very rare 【丹羽】6
Very rare 【塚本】6
Very rare 【信国】4
Very rare 【松本】7
Very rare 【宮城】6
Very rare 【森】7
Very rare 【山田】7
Very rare 【横山】7