Ultimately the Númenórean system came to be used throughout the western lands of Middle-earth, though it is unclear whether their special dedication to Telperion was retained. In general use, the Quenya names were normally maintained, except in the Shire. The Shire-hobbits used a version of the name translated into an ancient form of the Common Speech, resulting in Trewesdei. As the centuries passed, this name would gradually change, so by the end of the Third Age, it was generally referred to by the Shire-hobbits as Trewsday.
Notes
1
We have only approximate dating for this old form, which was said to be in use at least nine centuries before the War of the Ring. Over those nine hundred years it evolved into the later Trewsday, which was the common name for the day at the end of the Third Age.
2
Our only specific record of this usage is from the history of the Shire. Its use in Buckland or the Bree-land seems likely, but is not directly attested. For further discussion on this point, see footnote 2 to the entry for Sterrendei.