Etymology and distribution of Japanese surnames.

The Japanese surnames etymology dictionary.
https://play.google.com/store/apps/details?id=info.jigensha.jcedfreeGoogle Play で手に入れよう https://apps.apple.com/us/app/id1471109324
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徳島県 阿南市 長生町明谷中沢の名字

About 30 【神元】4
About 10 【清水】7
About 10 【久積】4
Very rare 【澤】5
Very rare 【鈴木】7