Uncertain. Ačaṙyan leaves the origin of the word open.
According to J̌ahukyan, perhaps from Proto-Indo-European *bʰug-, zero-grade of *bʰewg-, *bʰewgʰ- (“to bend”), whence Sanskrit भुज (bhúja, “arm; trunk of an elephant”). He assumes that the original meaning was "neck" (i.e. the turning organ) and for the sense development compares Latin collum (“neck”), Proto-Germanic *halsaz (“neck”) from Proto-Indo-European *kʷel- (“to turn”); also Russian шея (šeja) against Serbo-Croatian ошијати (“to turn around”). Finally, J̌ahukyan does not exclude the possibility of contamination of the sense "neck" with the sense "throat" deriving from *bʰewg- (“to consume”) (see բուծանեմ (bucanem) for this root).
- Armenian: բուկ (buk)
- Łazaryan, Ṙ. S.; Avetisyan, H. M. (2009), “պուկ”, in Miǰin hayereni baṙaran [Dictionary of Middle Armenian] (in Armenian), 2nd edition, Yerevan: University Press, page 660
- Norayr N. Biwzandacʿi (1884), “gorge”, in Baṙagirkʿ i gałłierēn lezuē i hayerēn [Dictionary from the French Language into Armenian], Constantinople: A. H. Boyajian Press, page 605b
- Ačaṙean, Hračʿeay (1971), “բուկ”, in Hayerēn armatakan baṙaran [Dictionary of Armenian Root Words] (in Armenian), volume I, 2nd edition, Yerevan: University Press, page 482b
- J̌ahukyan, Geworg (1991), “Stugabanutʿyunner [Etymologies]”, in Patma-banasirakan handes [Historical-Philological Journal] (in Armenian), issue 2, page 37
- J̌ahukyan, Geworg (2010), “բուկ”, in Sargsyan, Vahan, editor, Hayeren stugabanakan baṙaran [Armenian Etymological Dictionary] (in Armenian), Yerevan: Asoghik, page 139a