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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Popuration 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 Hokkaidou(About 70)
2 Iwate-ken(About 30)
3 Shizuoka-ken(About 10)
4 Chiba-ken(Very rare)
4 Aomori-ken(Very rare)