Etymology and distribution of 定常.

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 定常.

カンマ区切りで複数の名字を指定できます。

Etymology of 定常

Distribution of 定常
Ranking
1 Tottori-ken(0.0194%)
2 Hiroshima-ken(0.000577%)
3 Shiga-ken(0.000325%)
4 Hyougo-ken(0.000164%)
5 Saitama-ken(0.000147%)
6 Ibaraki-ken(0.000142%)
7 Kanagawa-ken(0.000123%)
8 Oosaka-fu(0.000115%)
9 Fukuoka-ken(Very rare)
10 Toukyou-to(Very rare)