Etymology and distribution of 三ツ間.

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 三ツ間.

カンマ区切りで複数の名字を指定できます。

Etymology of 三ツ間

Distribution of 三ツ間
Ranking
1 Gunma-ken(0.00162%)
2 Saitama-ken(0.00103%)
3 Tochigi-ken(0.000444%)
4 Kanagawa-ken(0.000184%)
5 Niigata-ken(0.000161%)
6 Oosaka-fu(0.000115%)
7 Toukyou-to(Very rare)