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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福島県 郡山市 逢瀬町多田野戸ノ内の名字

About 20 【細谷】6
About 20 【柳沼】5
Very rare 【安藤】7
Very rare 【沖野】5