An Etymological Dictionary of the German Language/Pfuhl
Pfuhl, m., ‘pool, puddle,’ from the equiv. MidHG. and OHG. pfuol, m.; corresponding to Du. poel, AS. pôl, E. pool. On account of the numerous West Teut. cognates, as well as the diffculties presented by its sound and form, the word cannot have been borrowed at an early period from Lat. pălus (acc. pălûd-em). The early history of the Teut. pôlo- is obscure.