Rían's dates only appear in a genealogical chart in volume 11 of The History of Middle-earth, and so cannot be considered absolutely canonical. The Silmarillion does imply that she died in the same year as the Nirnaeth Arnoediad (I 472) so these dates are consistent with the primary published text.
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The Etymologies (in volume 5 of The History of Middle-earth) explain the name Rían as deriving from ríg-anna, 'crown-gift'.
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