「Iwa」(いわ)さんの名字の由来、語源、分布。

Yamaguchi-ken Shimonoseki-shi · Tochigi-ken . There is an example of using a "valley" for a store of a shop name. In Yamaguchi - ken Shimonoseki - shi telling that it was renamed from Nakajima surname. Estimated in the Edo period. 中島 Nakajima reference.

2020年 7月 31日更新

Whole Japan		Prefectures
レベル	3	1　Shimane-ken(About 30) 2　Oosaka-fu(About 30) 3　Tottori-ken(About 20) 4　Saitama-ken(Very rare) 4　Wakayama-ken(Very rare)
Population	About 90
Ranking	33,267

Rank by city
1　Yasugi-shi(About 30) 2　Tottori-shi(About 10) 2　Sakai-shi(About 10) 4　Touhaku-gun Kotoura-chou(Very rare) 4　Ageo-shi(Very rare) 4　Hidaka-gun Hidaka-chou(Very rare) 4　Matsubara-shi(Very rare) 4　Neyagawa-shi(Very rare) 4　Tondabayashi-shi(Very rare)