Etymology and distribution of 外石.

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 外石.

カンマ区切りで複数の名字を指定できます。

Etymology of 外石

Distribution of 外石
Ranking
1 Niigata-ken(0.00483%)
2 Hokkaidou(0.00112%)
3 Toukyou-to(0.000398%)
4 Chiba-ken(0.000353%)
5 Toyama-ken(0.000342%)
6 Akita-ken(0.0003%)
7 Saitama-ken(0.00022%)
8 Kanagawa-ken(0.000184%)
9 Shizuoka-ken(0.000111%)
10 Aichi-ken(Very rare)