A grievous vision is declared unto me; the treacherous dealer dealeth treacherously, and the spoiler spoileth. Go up, O Elam: besiege, O Media; All sighing thereof have I made to cease.
-- Isaiah 21:2 (KJV)
Is Isaiah referring to Persia when he mentions Elam? The chapter is about the fall of Babylon. I've heard that the name "Persia" had come around by the Greeks during the reign of Alexander the Great, so Isaiah wouldn't had used it to describe them. But I've also heard that the Persians referred to themselves as the "Parsa" people, so he may have been able to use the name Parsa rather than Elam. Though I think Isaiah is talking about regions rather than peoples.
I'm not sure whether the region Persis (where the Persions came from) was recognised during Isaiah's time.
I've heard that the Persian (Parsa) people were descended from Elam, Shem's son. Would this be the reason why Isaiah would refer to the Persians as Elam, if he was referring to them at all?