Jamieson, Fausset & Brown, on Jer 51:27

“Set ye up a standard in the land: sound with the trumpet among the nations: prepare the nations against her: call together against her the kings of Ararat, Menni, and Ascenez: number Taphsar against her, bring the horse as the stinging locust.”

“(Jer 50:29). As in Jer 51:12 the Babylonians were told to "set up the standard," so here her foes are told to do so: the latter, to good purpose; the former, in vain. Ararat--Upper or Major Armenia, the regions about Mount Ararat. Minni--Lower or Lesser Armenia. RAWLINSON says that Van was the capital of Minni. It was conquered by Tettarrassa, the general of Tetembar II, the Assyrian king whose wars are recorded on the black obelisk now in the British Museum. Ashchenaz--a descendant of Japheth (Gen 10:3), who gave his name to the sea now called the Black Sea; the region bordering on it is probably here meant, namely, Asia Minor, including places named Ascania in Phrygia and Bithynia. Cyrus had subdued Asia Minor and the neighboring regions, and from these he drew levies in proceeding against Babylon. rough caterpillars--The horsemen in multitude, and in appearance bristling with javelins and with crests, resemble "rough caterpillars," or locusts of the hairy-crested kind (Nah 3:15).”

Imported from an open dataset — not yet checked against the printed edition.