Etymology and distribution of 戸草.

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 戸草.

カンマ区切りで複数の名字を指定できます。

Etymology of 戸草

Distribution of 戸草
Ranking
1 Iwate-ken(0.00228%)
2 Hokkaidou(0.00105%)
3 Aomori-ken(0.000262%)
4 Shizuoka-ken(0.000222%)
5 Chiba-ken(Very rare)