trasgo.

Unknown. Possible etymologies include: * from Latin trādux (“vine branch”), in the nominative (semantic connection is nebulous, possibly from the creatures hiding in vineyards in some folk legends); * from Old Galician-Portuguese transfegar (“to transfigure, to transfuse”), from Latin transfigurare, relating to the creature's ability to shapeshift; * from Ancient Greek τράγος (trágos, “male goat, lechery”), relating to mischief, its small stature, and other hircine attributes; * from Old Italian strega (“witch, hag”), from Latin striga (“evil spirit, witch, etc.”). * from a Gothic term for a goblin-like creature, introduced or reinforced during the Visigothic/Suebian period via Germanic folklore. * from Old Spanish tarasca, maybe influenced by Old Galician-Portuguese drago and/or Old Galician-Portuguese tardo (mythical sense) * from Old Spanish trasgreer or trasgueir (“make mischief”) (first attested in c. 15th century), from Latin transgredi, likewise referring to its mischievous nature. In which case, cognate to English transgress.