The Japanese surnames etymology dictionary.
Hyougo-ken Himeji-shi . There is a word of fairness. In Oosaka-fu tells that Mr. Hirai who took care of Abuto Shrine, Shingomine Shrine, which became a honor to the underground shrine of Hyougo-ken Toyooka-shi Morio, called the shrine. Estimated in the Edo period. 平井 reference.