An Etymological Dictionary of the German Language/Annotated/Felber

by Friedrich Kluge

Felber, masculine, ‘white willow,’ from Middle High German vëlwer, older vëlwâre, masculine, from vëlwe, ‘willow,’ Old High German fëlawa, fëlwa, feminine, ‘willow tree.’ Probably Osset. färwe, ‘alder,’ is primitively allied to it.’