[Maédhros]

From The Peoples of ME: The Shibboleth of Fëanor

The names of Sindarin form by which they were usually called in later song and legend were Finrod, Angrod (with wife Eðellos and son Arothir), Aegnor, and Galadriel.
In names however that ended in old words referring to status, rank, profession, race or kindred and so on the adjectival element still in Sindarin, following ancient models, might be placed first. Quenya Artaher (stem artahēr-) 'noble lord' was correctly Sindarized as Arothir.
The name of Angrod's son (still retaining the identity of 'Orodreth') was then changed from Artanáro to Artaresto. In an isolated note found with the genealogies, scribbled at great speed but nonetheless dated, August 1965, my father suggested that the best solution to the problem of Gil-galad's parentage was to find him in 'the son of Orodreth', who is here given the Quenya name of Artaresto, and continued:
Finrod left his wife in Valinor and had no children in exile. Angrod's son was Artaresto, who was beloved by Finrod and escaped when Angrod was slain, and dwelt with Finrod. Finrod made him his 'steward' and he succeeded him in Nargothrond. His Sindarin name was Rodreth (altered to Orodreth because of his love of the mountains .. ..... His children were Finduilas and Artanáro = Rodnor later called Gil-galad. (Their mother was a Sindarin lady of the North. She called her son Gil-galad.) Rodnor Gil-galad escaped and eventually came to Sirion's Mouth and was King of the Ñoldor there.
The words that I cannot read contain apparently a preposition and a proper name, and this latter could be faroth (the High Faroth west of the river Narog). - In the last of the genealogical tables Artanaro (Rodnor) called Gil-galad appears, with the note that 'he escaped and dwelt at Sirion's Mouth'. The only further change was the rejection of the name Artaresto and its replacement by Artaher, Sindarin Arothir; and thus in the excursus (note 23) Arothir [Orodreth] is named as Finrod's 'kinsman and steward', and (note 47) Gil-galad is 'the son of Arothir, nephew of Finrod'.

It seems that as Arothir suggests, the Sindarized name of Orodreth is indeed Arothir and that Orodreth is not an epessë, leaving therefore Orodreth as an invalid name.
By some strange reason I find myself liking the name Orodreth, so if I'm mistaken please let me know.