Snorri Sturluson states in his Gylfaginning (34) that "Loki's brothers are Býleistr and Helblindi", and several Eddic texts use the Loki-kenning "brother of Býleistr" (bróðir Býleists) (Völuspá, 51; Hyndluljóð, 40; Skáldskaparmál, 16).
Though not directly attested in any original source, scholars have considered Loki's brothers Helblindi and Býleistr to also be sons of Fárbauti.