Комментарии:EDT 136-137, ЭСТЯ 1, 451, Мудрак Дисс. 125, 131, Ашм. V, 263, Федотов 1, 99, 130. There also exists a similar - but originally different - form *og(u)l-, *ogluk, reflected in Chag. oɣluq, Tur. dial., Gag. holluq, Chuv. valak, Yak. (Пек.) uoluk, uol-ba, with natural contaminations.
