Etymology and distribution of 左良井.

Sarai 【左良井】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Toukyou-to . Fukui-ken Fukui-shi Major was in the Edo period in the Fukui clan of the clan office. The same clan says that he changed his name from Suyamayan surname during the Edo period. 陶山 Suyama reference.