Etymology and distribution of 久古.

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!

「久古」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 久古

Distribution of 久古
Ranking
1 Sousa-shi(0.203%)
2 Miyadzu-shi(0.109%)
3 Tokachishi-chou Rikubetsu-chou(0.0824%)
4 Hino-gun Hino-chou(0.0645%)
5 Narita-shi(0.0554%)
6 Gujou-shi(0.0521%)
7 Chichibu-gun Yokoze-machi(0.0372%)
8 Nishikasugai-gun Toyoyama-chou(0.0345%)
9 Tokachishi-chou Ashoro-chou(0.0314%)
10 Gero-shi(0.0259%)
11 Nishimuro-gun Kamitonda-chou(0.0251%)
12 Kyoutango-shi(0.0212%)
13 Ogachi-gun Ugo-machi(0.0186%)
14 Tokachishi-chou Otofuke-chou(0.0184%)
15 Sanbu-gun Yokoshibahikari-machi(0.0153%)
16 Shisou-shi(0.0148%)
17 Yachimata-shi(0.0147%)
18 Obihiro-shi(0.0109%)
19 Mie-gun Komono-chou(0.0109%)
20 Yonago-shi(0.0107%)
21 Chiba-shi Wakaba-ku(0.0105%)
22 Shiroi-shi(0.0105%)
23 Katou-shi(0.0105%)
24 Iwakura-shi(0.01%)
25 Chiba-shi Chuuou-ku(0.00932%)
26 Oosaka-shi Higashinari-ku(0.00651%)
27 Gotenba-shi(0.00533%)
28 Yokohama-shi Aoba-ku(0.00472%)
29 Shinjuku-ku(0.00468%)
30 Fukuchiyama-shi(0.00447%)
31 Tondabayashi-shi(0.00388%)
32 Kawachinagano-shi(0.00373%)
33 Chiba-shi Inage-ku(0.00367%)
34 Iruma-shi(0.0034%)
35 Arakawa-ku(0.00324%)
36 Kitami-shi(0.00287%)
37 Toshima-ku(0.00264%)
38 Atsugi-shi(0.00257%)
39 Tochigi-shi(0.00249%)
40 Ageo-shi(0.00235%)
41 Odawara-shi(0.0022%)
42 Koube-shi Kita-ku(0.0022%)
43 Hitachi-shi(0.00185%)
44 Kita-ku(0.00173%)
45 Mito-shi(0.00173%)
46 Sagamihara-shi(0.00166%)
47 Koutou-ku(0.00156%)
48 Suita-shi(0.00155%)
49 Toyota-shi(0.00121%)
50 Funabashi-shi(0.000953%)
51 Adachi-ku(0.000917%)
52 Kagoshima-shi(0.000752%)