Kamisuki 【上薄】3 The Japanese surnames etymology dictionary.
① There is a 木川 surname.
② Topography . Miyazaki-ken Ebino-shi From the gate of the Onikawa (Onikawa) gate division system that was in the Edo period in Ikishima. The name of the gate is from the river. A demon is estimated from a monster. The last name is also Onikawa.