Etymology and distribution of 洗井.

Arai 【洗井】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Yamaguchi-ken , Hyougo-ken . Yamaguchi-ken Yamaguchi-shi Tokodo moat is based. It was in the Edo period in the same place. He told me that he changed the name from Kawahira surname, which he had called from Kohira, a small figure in the same place. 川平 Kawahira reference.