Dyaus

In Vedic India, his Sanskrit name was Dyaus pitar, or "Father Sky," and the rules of linguistic evolution suggest the archaic Indo-European personification of atmospheric power was named Dieus or Dyevos.

Other passages suggest that Indra was the son of Dyaus and brother of Agni.

to Hastings' Encyclopaedia of Religion and Ethics which deal with Indian: birth, death and disposal of the dead, Brahman, Dyaus, light and darkness, (Hindu) worship.