Aud (Auðr) is the Old Norse word for "wealth" or "prosperity." **Aud the Deep-Minded (Auðr djúpúðga, 9th c.)** was the Norse-Gaelic noblewoman who led the settlement of Iceland — celebrated in the Landnámabók as one of the four most important original settlers and the first to bring Christianity to Iceland.
Used widely in modern Norway.
Aud reduces to four — the number of Norse wealth.