Английский Этимологический словарь - oak

- O.E. ac "oak tree," from P.Gmc. *aiks, the source of the tree name in most Gmc. languages (cf. O.H.G. eih), of uncertain origin. The usual I.E. base for "oak" (*derwo-/*dreu-) has become Mod.Eng. tree. The O.N. form was eik, but there were no oaks in Iceland so the word came to be used there for "tree" in general.