köken: Etymology tree Proto-Slavic *bùky Old Polish bukiew Polish bukiew Inherited from Old Polish bukiew. By surface analysis, buk + -ew. Doublet of bukwa (“letter of the Cyrillic alphabet”).
Compound of Buche + Ecker. The now rare simplex Ecker from Middle High German ackeran, eckern; only once attested in Old High German ekarn. Ultimately from Proto-Germanic *akraną, whence also English acorn. An original neuter or masculine whose final -n was interpreted as a plural morpheme and which was subsequently made into a feminine. Kluge (24th edition) considers it a chiefly Low German word…