Possibly ultimately from Proto-Germanic *wadą (“ford”), from Proto-Indo-European *wadʰom, perhaps through a Late Vulgar Latin *uadam. Compare French gué (“ford”). Other sources list it as deriving from Latin vadum , , itself from the same Proto Indo-European root as the Germanic, and thus cognate to it. However, it was likely influenced in pronunciation by the corresponding Germanic term (the change of Classical Latin 'V', originally pronounced /w/, to /v/ had probably already occurred in the Vulgar Latin dialects by the Proto-Romance era in the early Middle Ages; thus the normal result in Italian would have been *vado). Compare Spanish vado, Portuguese vau, Romanian vad, Sicilian vadu, which were not affected by the Germanic influence.
guado m (plural guadi)