Etymology and distribution of 國保.

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 國保.

カンマ区切りで複数の名字を指定できます。

Etymology of 國保

Distribution of 國保
Ranking
1 Miyagi-ken(0.000208%)
2 Aichi-ken(0.000202%)
3 Toukyou-to(0.000199%)
4 Gifu-ken(0.000189%)
5 Niigata-ken(0.000161%)
6 Fukuoka-ken(Very rare)