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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兵庫県 宝塚市 玉瀬新開の名字

About 10 【後中】3
About 10 【小東】4
Very rare 【池西】4
Very rare 【福田】7