Etymology and distribution of 久安.

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!

「久安」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 久安

Distribution of 久安
Ranking
1 Okayama-ken(About 500)
2 Hiroshima-ken(About 120)
3 Hyougo-ken(About 100)
4 Oosaka-fu(About 80)
5 Ishikawa-ken(About 50)
6 Aichi-ken(About 30)
6 Kyouto-fu(About 30)
8 Toukyou-to(About 20)
9 Saitama-ken(About 20)
9 Chiba-ken(About 20)
11 Fukuoka-ken(About 10)
11 Nara-ken(About 10)
13 Kagoshima-ken(About 10)
13 Kanagawa-ken(About 10)
13 Yamaguchi-ken(About 10)
13 Wakayama-ken(About 10)
17 Nagano-ken(Very rare)
17 Shiga-ken(Very rare)
17 Tochigi-ken(Very rare)
17 Ehime-ken(Very rare)
17 Iwate-ken(Very rare)
17 Gifu-ken(Very rare)
17 Hokkaidou(Very rare)
17 Mie-ken(Very rare)