The origin of a word 'Himorogi' (or 'Himoroki' in the ancient times) is as follows: 'Hi' refers to a divine spirit; 'moro' came from 'amoru,' meaning descending from the Heaven; and 'ki' means a tree.
「ひもろぎ」（古代には「ひもろき」）の語源は、「ひ」は神霊、「もろ」は天下るの意の「あもる」の転、「き」は木の意とされる。