Sauro (þ) (1), usually in longer form Sauron (þ), masc. name "the Abhorred", name of a Maia, the second Dark Lord (said to be the name by which he was "afterwards called", MR:147; according to PE17:183, his original name was Mairon, q.v.). Earlier Thauron (SA:thaur, THUS), archaic *Θaurond- (Letters:380, where the initial Greek letter represents th). The stem of Sauron* would then be Saurond-. Another form of the name is Súro**.
Primitive elvish
thaurond-
masculine name. Thaurond-
†Thauron (þauron) masc. name, earlier form of Sauron, before the change th > s (SA:thaur, cf. Letters:380, which suggests a stem _θ_aurond-; the initial Greek letter represents th). See Sauro, Sauron.