From Proto-Turkic *isig (“hot, warm”). Compare to Northern Altai изиг (izig), Shor изиг, Tuvan изиг (izig), Yakut итии (itii); Turkish ısı (“heat”), Karachay-Balkar исси (issi), Kumyk исси (issi), etc.
иъсиғ (ìsiɣ)