Tegin (Old Turkic: 𐱅𐰃𐰏𐰤, romanized: tegin, also tigin, MC *dək-gɨn > Pinyin: Tèqín; Chinese: 特勤, erroneously Tèlè特勒[2][3]) is a Turkic title, commonly attachable to the names of the junior members of the Khagan's family.[4][5][6] However, Ligeti cast doubts on the Turkic provenance by pointing to the non-Turkic plural form tegit.[7]
^Ancient Coin Collecting VI: Non-Classical Cultures, by Wayne G. Sayles p.81
^Sanping Chen, "Son of Heaven and Son of God: Interactions among Ancient Asiatic Cultures regarding Sacral Kingship and Theophoric Names", Journal of the Royal Asiatic Society, Third Series, Vol. 12, No. 3 (Nov., 2002), p. 296: Writing 勒 instead of 勤 is a common script error in current editions of almost all dynastic histories
^Jiu Tangshu vol 194 upper [1] "可汗者,猶古之單于;[...] 其子弟謂之特[勤] (ms. 特勒)" Tr. "the Kehan, in the past, was called Chanyu: [...] His sons and younger brothers are called Te[qin] (ms. Tele)"(in Chinese)
^Xin Tangshu Vol. 215 upper [2] (in Chinese) "至吐門,遂強大,更號可汗,猶單於也,[..] 子弟曰特[勤] (ms. 特勒)" tr. "Till Tumen, [who] has achieved strength and greatness and is now called Kehan, formerly Chanyu, [...] [his] sons and younger brothers are called Te[qin] (ms. Tele)
^Taskin V. S. "Materials on history of Dunhu group nomadic tribes", Moscow, 1984, p. 432
^Ligeti, L (1975), Kiadó, A (ed.), Researches in Altaic languages, University of Michigan, p. 48