Shanhui (山𤟤?) or Sanki (サンキ?) is a demon in the series.
From the ancient Chinese compendium of myth, Classic of Mountains and Seas chapter 3, Shanhui or Huizi (𤟤子) is a monster that appears with the body of a dog and the face of a man. When it encounters humans it will smile at them. Its appearance usually accompanied by disastrous wind.
"Origin: China. A doglike beast with a human head. When it sees people, it gives a cry that sounds like laughter. It's very fast, and since it is associated with winds, it may be a wind spirit itself."