KEUTHONYMOS (or Ceuthonymus) was a mysterious Daimon (Spirit) of the Underworld.
His name is derived from the word keuthos, which is used by Homer in the Iliad to describe the realm of Haides hypo keuthesi gaiês, "lying in the depths of the earth," and by Hesiod in the Theogony for the subterranean cavern of Ekhidna. Keuthonymos might mean either "The One Named in the Depths" or "Hidden Name."
Keuthonymos, father of Menoites, may have been the same as the Tartarean Titan Iapetos, father of a certain Menoitios who was struck by Zeus into the realm of Haides.
|MENOITES (Apollodorus 2.125)
Pseudo-Apollodorus, Bibliotheca 2. 125 (trans. Aldrich) (Greek mythographer C2nd A.D.) :
"The keeper of Haides' cattle Menoites, son of Keuthonymos."
- Apollodorus, The Library - Greek Mythography C2nd A.D.