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
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Ratio 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(0.00382%)
2 Yamagata-ken(0.000622%)
3 Hokkaidou(0.000419%)
4 Chiba-ken(0.000265%)
5 Hyougo-ken(0.000246%)
6 Okayama-ken(0.000203%)
7 Gunma-ken(0.000203%)
8 Nagano-ken(0.000164%)
9 Hiroshima-ken(0.000144%)
10 Oosaka-fu(0.000115%)
11 Toukyou-to(Very rare)