Etymology and distribution of 鉤.

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 鉤.

カンマ区切りで複数の名字を指定できます。

Etymology of 鉤

Distribution of 鉤
Ranking
1 Shiga-ken(About 40)
2 Kyouto-fu(About 20)
3 Hyougo-ken(Very rare)
3 Oosaka-fu(Very rare)
3 Aichi-ken(Very rare)
3 Toukyou-to(Very rare)
3 Kanagawa-ken(Very rare)