People of Turk esir’s.
Some scientists read the word
«Sir» (W. Radlow, H.Orkun, S.E.Malov, B.Bazylhan and others). The word’s etymology “sir = se” (Chinese sources: “Already in “Tan-shu” it was told, that the tribe (doubtless “Sirs” in the Tonuquq inscriptions) having subdued the “janto” tribe and having merged with them, became “se-jan-to”. //See: Грумм-Гржимайло Г.Е. Западная Монголия и Урянхайский край.Л, 1926. Том-2. С. 284 ; sie-yen-to (=sir tardus) - T.Tekin Tunyukuk yaziti Ankara, 1994.s. 3, 27, 64).