Proto-Germanic: *gūgi-z
Meaning: giant woman
Old Norse: gǖgr f. `Riesin', NIsl güg-ur `Trollweib'
Norwegian: gügr, jüvr, gjöger `Hexe'
Old Danish: güg `Unterirdischer', güger `Mörder, Räuber'
Danish: (old) güg `ein Unterirdfischer', güger `Mörder, Räber'