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Yaik is old. the name of the Ural River (for example, at Pushkin), since 1775 it has been called the Ural (see) (Ely 430). The ancient name is attested in the form Δάιξ (Ptolemy VI, 14, 2 et seq.), Δαίχ (Menander Proteus, frag. 21; K. Müller, Hist. Gr. Min. 2, 54, 31), Γεήχ (Const. Bagr ., De adm. imp. 37, 2). This name is Turkic. origin, cf. Tur., Crimean-Tat., Chagat., Uig., Alt. jajuk "spread out, wide" (Radlov 3, 75 ff., 77), Chuv. Jεjǝk "Ural river" (Paasonen, CsSz. 23), Kazakh. ǯajuk – the same (Radlov 4, 19), shor., sag. čajuk "flood" (Radlov 3, 1853); see Markwart, UJb. 9, 82; Kumanen 25; Moravchik, Buz.-Turs. 2, 109; Mikkola, JSFOu 30, No 33, 11. The last scholar reconstructs for the Greek. forms in Δ Turk. source *d᾽ajuq.
Oksus river - Turkic aksu - "white water" - is still an archaic Turkic name for the Amu Darya river(5 century BC)
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The Amu Darya[a] (also called the Amu, Amo River, or Jayhūn, and historically known by its Latin name Oxus or Greek Ὦξος)[2] is a major river in Central Asia and Afghanistan...
In classical antiquity, the river was known as the Ōxus in Latin and Ὦξος (Ôxos) in Greek — a clear derivative of Vakhsh, the name of the largest tributary of the river.[4] In Vedic Sanskrit, the river is also referred to as Vakṣu (वक्षु). The Brahmanda Purana refers to the river as Chaksu. The Avestan texts too refer to the River as Yakhsha/Vakhsha (and Yakhsha Arta ("upper Yakhsha") referring to the Jaxartes/Syr Darya twin river to Amu Darya).
