Etymology and distribution of 久一.

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!

「久一」さんの名字の分布比率。

カンマ区切りで複数の名字を指定できます。

Etymology of 久一

Distribution of 久一
Ranking
1 Kasaoka-shi(0.0871%)
2 Asakuchi-gun Satoshou-chou(0.0329%)
3 Mishima-gun Shimamoto-chou(0.0146%)
4 Kita-gun Miki-chou(0.0137%)
5 Ashiya-shi(0.0115%)
6 Koube-shi Chuuou-ku(0.00973%)
7 Asakuchi-shi(0.00903%)
8 Oosaka-shi Suminoe-ku(0.00851%)
9 Kadoma-shi(0.00779%)
10 Shirakawa-shi(0.0068%)
11 Takashima-shi(0.00676%)
12 Katano-shi(0.00618%)
13 Kashiwara-shi(0.00595%)
14 Koube-shi Suma-ku(0.00546%)
15 Sanda-shi(0.00505%)
16 Katori-shi(0.00471%)
17 Ikeda-shi(0.00467%)
18 Koube-shi Hyougo-ku(0.00427%)
19 Koube-shi Nagata-ku(0.00411%)
20 Ibaraki-shi(0.00401%)
21 Hiroshima-shi Minami-ku(0.00369%)
22 Marugame-shi(0.00366%)
23 Oosaka-shi Joutou-ku(0.00345%)
24 Akashi-shi(0.00326%)
25 Kawasaki-shi Miyamae-ku(0.00308%)
26 Fukuyama-shi(0.00269%)
27 Meguro-ku(0.00267%)
28 Kurashiki-shi(0.00267%)
29 Takatsuki-shi(0.00264%)
30 Atsugi-shi(0.00257%)
31 Hiroshima-shi Asaminami-ku(0.00253%)
32 Koube-shi Nishi-ku(0.00242%)
33 Numadzu-shi(0.00201%)
34 Yokohama-shi Kouhoku-ku(0.00197%)
35 Higashioosaka-shi(0.00187%)
36 Okayama-shi(0.00138%)
37 Ichinomiya-shi(0.00123%)
38 Takamatsu-shi(0.00104%)
39 Sakai-shi(0.000572%)