In chapter 24 of Skáldskaparmál, means of referring to Jörð, the personified earth, are provided, including "sister of Auðr" and "sister of Dagr", the personified day.
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In the same chapter, a work by the 10th century skald Hallfreðr vandræðaskáld is provided that mentions Auðr ("Auðr's splendid sister").
The word is a compound of *all "whole, full" and *ōd "estate, property" (cf. Old Saxon ōd, Old English ead, Old Norse auðr).