Os Eldar renomearam-no Sauron
Among those of his servants that have names the greatest was that spirit whom the Eldar called Sauron, or Gorthaur the Cruel.
The Silmarillion: Valaquenta
O Completo Tolkien Companion Por JEA Tyler (embora não seja muito bem canon) sugere o seguinte
Sauron is a later name given to him by the High-elves in their own language, and means ‘the Abhorred’, while the Grey-elves knew him as Gorthaur ‘the Cruel’.
The Complete Tolkien Guide
Isto apóia o acima mencionado que ele foi renomeado pelos Elfos de Valinor.