Etymology and distribution of 牛窪.

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 牛窪.

カンマ区切りで複数の名字を指定できます。

Etymology of 牛窪

Distribution of 牛窪
Ranking
1 Saitama-ken(About 600)
2 Toukyou-to(About 140)
3 Tochigi-ken(About 100)
4 Kanagawa-ken(About 70)
5 Chiba-ken(About 30)
5 Oosaka-fu(About 30)
5 Gunma-ken(About 30)
8 Shizuoka-ken(About 30)
9 Kyouto-fu(About 20)
9 Hokkaidou(About 20)
9 Kumamoto-ken(About 20)
12 Ibaraki-ken(About 20)
12 Kagoshima-ken(About 20)
14 Aichi-ken(About 10)
15 Hyougo-ken(About 10)
16 Mie-ken(Very rare)
16 Nara-ken(Very rare)
16 Hiroshima-ken(Very rare)
16 Shiga-ken(Very rare)
16 Fukushima-ken(Very rare)
16 Aomori-ken(Very rare)
16 Kagawa-ken(Very rare)