Zimri. The Zimri were a people to the northeast of Assyria, against whom various Assyrian kings waged war. Whether they axe to be connected with the Zimran of Genesis 25:2 seems doubtful; their locality hardly suits.
Elam. Elam, one of the most ancient monarchies in the world (comp. Genesis 14:1-24.), is again coupled with Media in Isaiah 21:2. It was a region on the east of the lower Tigris, bounded westward by Babylonia, northward by Assyria and Media, southward by the Persian Gulf.
To say that it is put either here or anywhere else in the Old Testament for the whole of Persia seems a mistake, as the Persians were hardly known before the time of Cyrus.