Where does “diga” come from?

diga (Italian) comes from French digue, from Middle French digue, from Old French dike, from Middle Dutch dijc, from Old Dutch diic, from Frankish *dīk, from Proto-Germanic dīkaz, from Proto-Indo-European dʰēygʷ- — to stick into, pierce.

diga (Italian): an hydraulic barrier built for protection...