Etymology and distribution of 丸之内.

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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Ratio of 丸之内.

カンマ区切りで複数の名字を指定できます。

Etymology of 丸之内

Distribution of 丸之内
Ranking
1 Mie-ken(0.000876%)
2 Aichi-ken(0.000134%)
3 Shizuoka-ken(0.000111%)
4 Chiba-ken(Very rare)
5 Hyougo-ken(Very rare)
6 Oosaka-fu(Very rare)