Etymology and distribution of 友井.

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!

「友井」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 友井

Distribution of 友井
Ranking
1 Oosaka-fu(About 300)
2 Kanagawa-ken(About 300)
3 Hyougo-ken(About 200)
4 Toukyou-to(About 200)
5 Hiroshima-ken(About 200)
6 Toyama-ken(About 70)
7 Miyazaki-ken(About 50)
8 Kumamoto-ken(About 40)
9 Fukuoka-ken(About 30)
9 Nara-ken(About 30)
9 Hokkaidou(About 30)
12 Shizuoka-ken(About 30)
12 Ehime-ken(About 30)
14 Chiba-ken(About 30)
15 Shiga-ken(About 20)
16 Saitama-ken(About 20)
16 Mie-ken(About 20)
18 Ishikawa-ken(About 10)
19 Kagoshima-ken(About 10)
19 Kyouto-fu(About 10)
21 Ibaraki-ken(Very rare)
21 Fukui-ken(Very rare)
21 Okinawa-ken(Very rare)
21 Tochigi-ken(Very rare)
21 Aichi-ken(Very rare)
21 Okayama-ken(Very rare)
21 Yamanashi-ken(Very rare)
21 Yamagata-ken(Very rare)
21 Yamaguchi-ken(Very rare)