10th cent. From Latin vadum "ford."
From Proto-Italic *waþo- 'id.' From Proto-Indo-European *u̯h2dh-o- 'id.'
Also the origin of numerous surnames including Vado, Vados, Bado, Bados, Vadillo, Vadillos, Badillo, Vadal, Vade, Vahillo, Badi, Vaillo, Vaello, Baelo, Badino, Badilla, and Badosa.
Portuguese vau, French gué, Italian guado, Romanian vad, Sardinian badu
Welsh go-di-wawd "overtook"
Old Norse vað "to wade," Old High German watan 'id.,' Old English wadan 'id.' (English to wade)