Etymology and distribution of 當山.

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 當山.

カンマ区切りで複数の名字を指定できます。

Etymology of 當山

Distribution of 當山
Ranking
1 Okinawa-ken(About 1,600)
2 Kanagawa-ken(About 40)
3 Oosaka-fu(About 30)
4 Fukuoka-ken(About 30)
5 Toukyou-to(About 30)
6 Hyougo-ken(About 10)
6 Saitama-ken(About 10)
6 Gunma-ken(About 10)
6 Kouchi-ken(About 10)
10 Chiba-ken(About 10)
10 Nara-ken(About 10)
10 Miyazaki-ken(About 10)
10 Gifu-ken(About 10)
10 Aichi-ken(About 10)
10 Niigata-ken(About 10)
10 Tochigi-ken(About 10)
10 Kagoshima-ken(About 10)
18 Miyagi-ken(Very rare)
18 Yamaguchi-ken(Very rare)
18 Hiroshima-ken(Very rare)
18 Kagawa-ken(Very rare)