Wikipedia
The Xiongnu (Old Chinese: /qʰoŋ.nˤa/, Wade–Giles: Hsiung-nu), were a confederation of nomadic peoples who, according to ancient Chinese sources, inhabited the eastern Asian Steppe from the 3rd century BC to the late 1st century AD. Chinese sources report that Modu Chanyu, the supreme leader after 209 BC, founded the Xiongnu Empire.
After their previous overlords, the Yuezhi, migrated into Central Asia during the 2nd century BC, the Xiongnu became a dominant power on the steppes of north-east Central Asia, centred on an area known later as Mongolia. The Xiongnu were also active in areas now part of Siberia, Inner Mongolia, Gansu and Xinjiang. Their relations with adjacent Chinese dynasties to the south east were complex, with repeated periods of conflict and intrigue, alternating with exchanges of tribute, trade, and marriage treaties.
Attempts to identify the Xiongnu with later groups of the western Eurasian Steppe remain controversial. The identity of the ethnic core of Xiongnu has been a subject of varied hypotheses, because only a few words, mainly titles and personal names, were preserved in the Chinese sources. The name Xiongnu may be cognate with that of the Huns and/or the Huna, although this is disputed. Other linguistic links – all of them also controversial – proposed by scholars include Iranian, Mongolic, Turkic, Uralic Yeniseian, Tocharian, or multi-ethnic.