Etymology and distribution of 公文.

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
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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!
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「公文」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 公文

Distribution of 公文
Ranking
1 Kouchi-ken(About 2,900)
2 Oosaka-fu(About 300)
3 Kanagawa-ken(About 200)
4 Hyougo-ken(About 200)
5 Toukyou-to(About 200)
6 Kyouto-fu(About 200)
7 Nagasaki-ken(About 110)
7 Aichi-ken(About 110)
9 Chiba-ken(About 90)
10 Fukuoka-ken(About 80)
10 Hiroshima-ken(About 80)
12 Miyazaki-ken(About 60)
12 Saga-ken(About 60)
14 Tokushima-ken(About 40)
14 Okayama-ken(About 40)
16 Kagawa-ken(About 40)
16 Saitama-ken(About 40)
18 Shiga-ken(About 30)
19 Tochigi-ken(About 30)
19 Ehime-ken(About 30)
21 Shizuoka-ken(About 20)
21 Nagano-ken(About 20)
21 Wakayama-ken(About 20)
21 Hokkaidou(About 20)
25 Nara-ken(About 20)
26 Ishikawa-ken(About 10)
26 Gifu-ken(About 10)
28 Kagoshima-ken(About 10)
28 Ibaraki-ken(About 10)
28 Gunma-ken(About 10)
28 Fukushima-ken(About 10)
28 Yamanashi-ken(About 10)
28 Yamaguchi-ken(About 10)
28 Mie-ken(About 10)
35 Shimane-ken(Very rare)
35 Ooita-ken(Very rare)