born' or 'strong'. Scholars, including Toru Haneda, Onogawa Hidemi, and Geng Shimin believed that Di, Dili, Dingling, Chile and Tujue all came from the Turkic word Türk, which means 'powerful' and 'strength', and its plural form is Türküt. Even though Gerhard Doerfer supports the proposal that türk means 'strong' in general, Gerard Clauson points out that "the word türk is never used in the generalized sense of 'strong'" and that türk was originally a noun and meant "'the culminating point of maturity' (of a fruit, human being, etc.), but more often used as an [adjective] meaning (of a fruit) 'just fully ripe'; (of a human being) 'in the prime of life, young, and vigorous'". Turkologist Peter B. Golden agrees that the term Turk has roots in Old Turkic. yet is not convinced by attempts to link Dili, Dingling, Chile, Tele, & Tiele, which possibly transcribed *tegrek (probably meaning 'cart'), to Tujue, which transliterated Türküt. The Chinese Book of Zhou (7th century) presents an etymology of the name Turk as derived from 'helmet', explaining that this name comes from the shape of a mountain where they worked in the Altai Mountains. Hungarian scholar András Róna-Tas (1991) pointed to a Khotanese-Saka word, tturakä 'lid', semantically stretchable to 'helmet', as a possible source for this folk etymology, yet Golden thinks this connection requires more data. The earliest Turkic-speaking peoples identifiable in Chinese sources are the Yenisei Kyrgyz and Xinli, located in South Siberia. Another example of an early Turkic population would be the Dingling. Medieval European chroniclers subsumed various Turkic peoples of the Eurasian steppe under the "umbrella-identity" of the "Scythians". Between 400 CE and the 16th century, Byzantine sources use the name Σκύθαι (Skuthai) in reference to twelve different Turkic peoples. In the modern Turkish language as used in the Republic of Turkey, a distinction is made between "Turks" and the "Turkic peoples" in loosely speaking: the term Türk corresponds specifically to the "Turkish-speaking" people (in this context, "Turkish-speaking" is considered the same as "Turkic-speaking"), while the term Türki refers generally to the people of modern "Turkic Republics" (Türki Cumhuriyetler or Türk Cumhuriyetleri). However, the proper usage of the term is based on the linguistic classification in order to avoid any political sense. In short, the term Türki can be used for Türk or vice versa. List of ethnic groups Historical Turkic groups Az Dingling Bulgars Esegel Barsils Alat Basmyl Onogurs Saragurs