Most linguists trace the etymology of the name Οὐρανός to a Proto-Greek form *Worsanós (Ϝορσανός), enlarged from *ṷorsó- (also found in Greek οὐρέω (ouréō) 'to urinate', Sanskrit varṣá 'rain', Hittite ṷarša- 'fog, mist'). The basic Indo-European root is *ṷérs- 'to rain, moisten' (also found in Greek eérsē 'dew', Sanskrit várṣati 'to rain', or Avestan aiβi.varəšta 'it rained on'), making Ouranos the "rain-maker", or the "lord of rain".
A less likely etymology is a derivative meaning 'the one standing on high' from PIE *ṷérso- (cf. Sanskrit várṣman 'height, top', Lithuanian viršùs 'upper, highest seat', Russian verx 'height, top'). Of some importance in the comparative study of Indo-European mythology is the identification by Georges Dumézil (1934) of Uranus with the Vedic deity Váruṇa (Mitanni Aruna), god of the sky and waters, but the etymological equation is now considered untenable.