From Proto-Turkic *ẹ̆dŋe-r (“saddle”).
Cognate with Kazakh ер (er), Bashkir эйәр (eyär), Uzbek egar, Uyghur ئېگەر (ëger), Azerbaijani yəhər, Turkish eyer, Khakas изер (izer), Shor эзер (ezer), Tuvan эзер (ezer), Yakut ыҥыыр (ıñıır, “saddle”), etc.
ээр • (eer)