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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富山県 高岡市 上伏間江の名字

About 70 【筏井】4
About 40 【藤牧】5
Very rare 【石村】5
Very rare 【串田】5