Etymology and distribution of 青貫.

Aonuki 【青貫】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Okayama-ken Okayama-shi , Okayama-ken Setouchi-shi .

① There is 赤松 surname. It was in the Okayama-ken during the Warring States Period. 赤松 Akamatsu reference.

② Fukushima-ken Yama-gun Bandai-machi Origin of the red branch. A place name with a record since the Edo period. The place name was also written as "Akai field".