↑ Albanische Etymologien (Untersuchungen zum albanischen Erbwortschatz), Bardhyl Demiraj, Leiden Studies in Indo-European 7; Amsterdam - Atlanta 1997, p.125
Etymology
From Proto-Albanian*duaigā, from Proto-Indo-European*duoi-, from the root *du 'binary, consisting of two'. Cognate to Old High German zwig(“forking, crotch (of tree); bough, branch”)[1].