In Sindarin, the language J.R.R. Tolkien made up for his Lord of the Rings books, Arwen means "noble maiden." It first showed up in the US top 7000 in 1968, and was quietly used until The Fellowship of the Ring was released in 2001 when it became more popular. I have also found Arwen (and Arwyn being the masculine form) listed in 2 welsh name books, one says it means "fair; fine" and the other says it's an intensifying prefix + gwyn "white; holy." Arwenna is listed as a variant for girls.
See Also: Arwyn, Arrowin

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