Arwyn is a Welsh-style name meaning fair, noble, or inspired, depending on the exact root and form intended.
R. Tolkien's The Lord of the Rings, where Arwen Undómiel is the elven princess who chooses mortality for love of Aragorn. Tolkien derived his Arwen from Welsh and Sindarin elements: ar- ("noble" or "royal") and wen/wyn ("white," "fair," or "blessed"), producing "noble maiden" or "fair one."
The Welsh suffix -wyn is itself a marker of beauty and sanctity in Celtic naming tradition, shared by names like Gwyn, Bronwyn, and Alwyn. Arwyn with a 'y' rather than an 'e' is a slightly more distinctly Welsh masculine or gender-neutral variant, though in modern usage the name crosses freely. Beyond Tolkien, the Welsh tradition from which Arwyn draws is one of the oldest surviving literary cultures in Europe — the poems of Taliesin, the Mabinogion, the elegies of Llywarch Hen all breathe in names like this one.
Wales preserved a linguistic inheritance that the Norman conquest of England could not fully erase, and Welsh names carry in their very syllables the sound of that resistance and continuity. Arwyn belongs to that lineage: a name that sounds like it was carved from the landscape of a very old island. In contemporary usage, Arwyn appeals to parents drawn to Celtic heritage, to Tolkien's literary universe, or simply to the aesthetic of names that are soft-consonant and vowel-rich. It is unusual enough to feel distinctive, familiar enough through Arwen's cultural footprint to feel navigable — a name at once mythological and genuinely Welsh.