An Etymological Dictionary of the German Language/Wall
Wall, m., ‘rampart, mound, embankment,’ from the equiv. MidHG. wal (ll), m. and n.; OHG. *wal is by chance not recorded. Comp. OSax. wal (ll), Du. val, ‘rampart,’ AS. weall, E. wall. This West Teut. word, which is certainly borrowed from the equiv. Lat. vallum, vallus, seems to belong to the earliest loan-words from Lat. (comp. Straße, Mauer); primit. kinship with the Lat. word is very improbable.