「Iwadan」(いわだん)さんの名字の由来、語源、分布。

Kagoshima-ken Satsumasendai-shi · Oosaka-fu · Toukyou-to . Warriors of Warring States period had the name of Gamo Niigo. 蒲生 Gamou reference.

2022年 7月 28日更新

Whole Japan		Prefectures
レベル	2	1　Toyama-ken(About 20) 2　Kyouto-fu(About 10) 3　Oosaka-fu(Very rare) 3　Chiba-ken(Very rare)
Population	About 30
Ranking	Out of ranking

Rank by city
1　Toyama-shi(About 20) 2　Kyouto-shi Yamashina-ku(About 10) 3　Funabashi-shi(Very rare) 3　Oosaka-shi Higashisumiyoshi-ku(Very rare)

Rank by subregion
1　京都府京都市山科区北花山中道町(About 10) 1　富山県富山市布瀬町(About 10)

Etymology and distribution of 岩段.