An Etymological Dictionary of the German Language/Annotated/Felber
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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.’