Etymology and distribution of 岩口.

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!

「岩口」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 岩口

Distribution of 岩口
Ranking
1 Toyama-ken(0.00993%)
2 Nagasaki-ken(0.00567%)
3 Wakayama-ken(0.00548%)
4 Mie-ken(0.00547%)
5 Shiga-ken(0.00519%)
6 Fukui-ken(0.00478%)
7 Nara-ken(0.00356%)
8 Fukuoka-ken(0.00326%)
9 Ehime-ken(0.00295%)
10 Kyouto-fu(0.00283%)
11 Hiroshima-ken(0.00245%)
12 Hyougo-ken(0.0023%)
13 Ooita-ken(0.00225%)
14 Aichi-ken(0.00202%)
15 Kumamoto-ken(0.00183%)
16 Oosaka-fu(0.00173%)
17 Gifu-ken(0.00132%)
18 Nagano-ken(0.00131%)
19 Kagoshima-ken(0.00122%)
20 Hokkaidou(0.00105%)
21 Kouchi-ken(0.000861%)
22 Kanagawa-ken(0.000736%)
23 Miyazaki-ken(0.000679%)
24 Saitama-ken(0.000661%)
25 Toukyou-to(0.000647%)
26 Aomori-ken(0.000524%)
27 Gunma-ken(0.000405%)
28 Chiba-ken(0.000353%)
29 Ishikawa-ken(0.000342%)
30 Yamagata-ken(0.000311%)
31 Yamaguchi-ken(0.000239%)
32 Shizuoka-ken(0.000222%)
33 Tochigi-ken(0.000222%)
34 Miyagi-ken(0.000208%)