Based on comparison between the adjective form *dǫbrъ and Proto-Germanic *timrą (“timber”), Lithuanian dum̃blas (“swamp”), it appears that the etymon descends from a Caland's root (probably Proto-Indo-European *dem- (“to build”)). The exact etymology, however, is uncertain.
The etymon is attested both as an o-stem and as a u-stem, but per Vasmer, the original more likely was u-stem.
- South Slavic:
- Vasmer, Max (1964–1973), “дуб”, in Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Oleg Trubachyov, Moscow: Progress
- ^ Derksen, Rick (2008), “*dǫ̑bъ”, in Etymological Dictionary of the Slavic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 4), Leiden, Boston: Brill, →ISBN, page 114: “m. o (c) ‘oak’”
- ^ Olander, Thomas (2001), “dǫbъ”, in Common Slavic accentological word list, Copenhagen: Editiones Olander: “c (NA 126; PR 137); d (RPT 102)”