Etymology and distribution of 一刀.

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
↑オフライン検索できるアプリもどうぞ

Popuration of 一刀.

カンマ区切りで複数の名字を指定できます。

Etymology of 一刀

Distribution of 一刀
Ranking
1 Fukushima-ken(About 80)
2 Hokkaidou(About 30)
3 Hyougo-ken(About 10)
3 Chiba-ken(About 10)
5 Oosaka-fu(About 10)
5 Yamagata-ken(About 10)
5 Toukyou-to(About 10)
8 Okayama-ken(Very rare)
8 Hiroshima-ken(Very rare)
8 Gunma-ken(Very rare)
8 Nagano-ken(Very rare)