Proper noun
(Greek mythology) A daughter of Erechtheus and Praxithea.
(Greek mythology) A daughter of Phoroneus or Colontas.
(Greek mythology) One of the Alkyonides.
(Greek mythology) An epithet for several chthonic deities, including Demeter, Hecate, Melinoe, and Nyx.
(Greek mythology) An ancient mythical and poetic name for Crete.
Source: en.wiktionary.orgThe association of Tantalus with the underworld is underscored by the names of his mother Plouto ("riches", as in gold and other mineral wealth), and grandmother, Chthonia ("earth"). Source: Internet