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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Popuration 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(About 140)
2 Hiroshima-ken(About 20)
3 Hyougo-ken(About 10)
3 Saitama-ken(About 10)
3 Oosaka-fu(About 10)
3 Kanagawa-ken(About 10)
7 Toukyou-to(Very rare)
7 Shiga-ken(Very rare)
7 Fukuoka-ken(Very rare)
7 Ibaraki-ken(Very rare)