Комментарии:VEWT 69, TMN 2, 413, EDT 338, ЭСТЯ 2, 112-113, Дыбо 1997, 78-79, Лексика 348-349, Stachowski 57. In Егоров 160, Федотов 1, 431 the Chuv. form is regarded as a variant of pexil 'blessing' ( < Pers.), which is insecure phonetically. Derivation from bele'swaddle' (Clark 1977, 132) is highly dubious. The labialized vowel in Bashk., Tat. is a result of contamination with *bölek 'part'. Turk. > WMong. beleg, Kalm. belǝg (KW 41; TMN ibid., Щербак 1997, 104), whence Evk. belek etc., see Doerfer MT 141 (but Аникин 127 regards Evk. belek as borrowed < Yak.).