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 does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Aud reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.