From Tolkien Gateway
Soron (archaic þoron) means "eagle" in Quenya. The form soron may only be the form of this word used in compounds. As an independent word, Tolkien wrote it as sorno in a letter from 1972. Earlier, in the Etymologies of the 1930s, soron "eagle" appeared beside an alternate form sorne, but its plural form sorni ("eagles") indicated that sorne was the common form.
- Sindarin thoron
This word derives from the primitive þoronō from the root THORON "eagle", an extension of the root THOR "come swooping down". In the development of Quenya words from Common Eldarin, a short vowel that follows another vowel of the same quality was lost, so that primitive þoronō developed into þorno and then sorno.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Appendix: Elements in Quenya and Sindarin Names", thoron
- ↑ 2.0 2.1 2.2 J.R.R. Tolkien; Humphrey Carpenter, Christopher Tolkien (eds.), The Letters of J.R.R. Tolkien, Letter 347, (dated 17 December 1972), p. 426-7
- ↑ 3.0 3.1 J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, Part Three: "The Etymologies", THOR