Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
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山梨県 南都留郡道志村 白井平の名字

About 70 【水越】5
About 30 【池谷】6
Very rare 【飯村】5
Very rare 【角井】5
Very rare 【笠井】6
Very rare 【川崎】6
Very rare 【北浦】5
Very rare 【後藤】7
Very rare 【塩月】5
Very rare 【田中】7
Very rare 【平賀】5
Very rare 【渡辺】7