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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秋田県 雄勝郡東成瀬村 岩井川合居の名字

About 20 【谷藤】5
About 10 【佐々木】7
Very rare 【高谷】6
Very rare 【半田】6