From Between the Woods and the Water: On Foot to Constantinople: From the Middle Danube to the Iron Gates, by Patrick Leigh Fermor (Journey Across Europe Book 2, NYRB Classics, 2011), Kindle pp. 54-55:
When I had unfolded my map under the carob tree, the Tisza river, flowing south-east to join the Danube, uncoiled straight ahead of my path; I was struck by the place-names scattered beyond the east bank: Kúncsorba, Kúnszentmartón, Kúnvegytöke, and so on. The first syllable, it seemed, meant ‘Cuman’ and the region was still known as Nagykunság or Great Cumania. On my side of the river, a slightly different profusion spread southwards: Kiskúnhalas, Kiskúnfélegyháza, Kiskúndorozsma. ‘Kis’ means ‘little’: they belonged to the region of Kiskunság or Little Cumania.
So this was where the Cumans had ended up! And, even closer to my route, lay a still more peculiar paper-chase of place-names. Jászboldogháza, for instance, only a few miles north; and a bit farther afield, Jászladány, Jászapáti, Jászalsószentgyörgy, and many more… Here the first syllable recalled a more unexpected and still hoarier race of settlers. In the third century BC, the Jazyges, an Iranian speaking branch of the Sarmatians mentioned by Herodotus, were first observed in Scythian regions near the Sea of Azov, and some of them made their way to the west. They were allies of Mithridates—Ovid speaks of them in his Black Sea exile—and, between the Danube and the Tisza, exactly where their descendants finally settled, the Romans had much trouble with them. We know just what these Jazyges looked like from the column of Marcus Aurelius in the Piazza Colonna. The bas-relief warriors—and their horses, right down to their fetlocks—are sheathed in scale-armour like pangolins. Javelins lost, and shooting backwards in the famous Parthian style, they canter with bent bows up the spiral. Had they left any other traces in the Plain? Any dim, unexplained custom, twist of feature, scrap of language, or lingering turn of phrase? A few sparse reminders of the Pechenegs and the Cumans still flicker about the Balkans; but this entire nation seems to have vanished like will o’ the wisps and only these place-names mark the points of their evaporation.