Etymology and distribution of 小更.

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 小更.

カンマ区切りで複数の名字を指定できます。

Etymology of 小更

Distribution of 小更
Ranking
1 Ibaraki-ken(0.0047%)
2 Hiroshima-ken(0.000865%)
3 Shimane-ken(0.000463%)
4 Toukyou-to(0.000398%)
5 Chiba-ken(0.000353%)
6 Shiga-ken(0.000325%)
7 Saitama-ken(0.000147%)
8 Kanagawa-ken(0.000123%)
9 Hyougo-ken(Very rare)
10 Oosaka-fu(Very rare)