An Etymological Dictionary of the German Language/Felber

by Friedrich Kluge

Felber, m., ‘white willow,’ from MidHG. vëlwer, older vëlwâre, m., from vëlwe, ‘willow,’ OHG. fëlawa, fëlwa, f., ‘willow tree.’ Probably Osset. färwe, ‘alder,’ is primit. allied to it.’