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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Popuration 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(About 140)
2 Toukyou-to(About 30)
3 Hiroshima-ken(About 30)
4 Chiba-ken(About 20)
5 Saitama-ken(About 10)
5 Kanagawa-ken(About 10)
7 Hyougo-ken(Very rare)
7 Oosaka-fu(Very rare)
7 Shimane-ken(Very rare)
7 Shiga-ken(Very rare)