Etymology and distribution of 久具.

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
↑オフライン検索できるアプリもどうぞ
在日通名大全

日本初、在日通名の研究書「在日通名大全」発売中!
ネットの電話帳 住宅地図 マッポン!

「久具」さんの名字の分布数。

カンマ区切りで複数の名字を指定できます。

Etymology of 久具

Distribution of 久具
Ranking
1 Kamiamakusa-shi(About 20)
2 Kumamoto-shi(About 10)
2 Oomuta-shi(About 10)
2 Hitachi-shi(About 10)
5 Tagawa-gun Itoda-machi(About 10)
6 Funabashi-shi(Very rare)
6 Hanyuu-shi(Very rare)
6 Kani-shi(Very rare)
6 Kitanagoya-shi(Very rare)
6 Nagoya-shi Midori-ku(Very rare)
6 Toyokawa-shi(Very rare)
6 Toyoake-shi(Very rare)
6 Kitakyuushuu-shi Yahatanishi-ku(Very rare)
6 Kitakyuushuu-shi Kokurakita-ku(Very rare)
6 Kitakyuushuu-shi Moji-ku(Very rare)
6 Dazaifu-shi(Very rare)
6 Ogoori-shi(Very rare)
6 Tagawa-shi(Very rare)
6 Chikushi-gun Nakagawa-machi(Very rare)
6 Onga-gun Mizumaki-machi(Very rare)