Etymology and distribution of 蒼原.

Aohara 【蒼原】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Niigata-ken Sado-shi · Hokkaidou . Terrain . It was in Niigata-ken Sado-shi during the Edo period. It is said that Mr. Akahashi inserted "Jiang" at the same place. 赤橋 Akahashi reference.