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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青森県 下北郡風間浦村 易国間桑畑の名字

About 20 【坪田】5
About 20 【浜辺】5
About 10 【木下】6
About 10 【沢井】6
About 10 【宮古】4
Very rare 【嘉賀】3
Very rare 【八戸】5
Very rare 【横浜】5