stylistic:style_transfer, structural:summarization
Etymology

"Dzungar" is a compound of the Mongolian word jegün (züün), meaning "left" or "east" and γar meaning "hand" or "wing". The region of Dzungaria derives its name from this confederation. Although the Dzungars were located west of the Khalkas, the derivation of their name has been attributed to the fact that they represented the left wing of the Oirats. In the early 17th century, the head of the Oirat confederation was the leader of the Khoshut, Gushi Khan. When Gushi Khan decided to invade Tibet to replace the local Tsangpa khan in favor of rule by the Gelug, the Oirat army was organized into left and right wing. The right wing consisting of Khoshuts and Torguts remained in Tibet while the Choros and Khoid of the Left wing retreated north into the Tarim basin, since then the powerful empire of the Choros became known as the Left Wing, i.e. Zuungar.

The region was separately described in contemporary European sources as the Kingdom of the Eleuths, from an infelicitous transcription of the name " Oirats " by French missionaries. This was sometimes vaguely extended to cover wide areas of Central Asia, including Afghanistan.