Hidari 【左】3 The Japanese surnames etymology dictionary.
Hyougo-ken , Miyagi-ken Tome-shi , Yamagata-ken . Terrain . From the side of the lake. Miyagi-ken Tome-shi Meiji New surname by monk of Toyo Temple in Toyo -dori Soto sect in Towa-cho. Tell the shrine that Shiga-ken is out. The pronunciation is Kosui.
※ There was a belief that it occurred at the time of the Meiji New surname due to a mistake by officials applying for the tide (Ushio) last name. Location unknown. 潮 reference.