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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長野県 上田市 古安曽柳沢の名字

About 50 【宮原】6
About 30 【坂田】6
Very rare 【小林】7
Very rare 【干場】5
Very rare 【関田】5
Very rare 【竹沢】5
Very rare 【冨里】4
Very rare 【富里】4