ラテン語のファウヌス(農耕と牧畜の神)が語源で、ギリシャ神話のパンに相当する。
The faun is now regarded rather as the type of unsophisticated & the satyr of unpurified man; the first is man still in intimate communion with Nature, the second is man still swayed by bestial passions. [Fowler]The plural is fauni. The word is of uncertain origin. De Vaan suggests Proto-Italic *fawe/ono-, from a PIE word meaning "favorable," with cognates in Old Irish buan "good, favorable; firm," Middle Wensh bun "maiden, sweetheart."