Etheldreda

Atheldreda is a variant name. (Source: Charles, M 2006, The Big Book of Baby Names: Every Parent's Inspirational Guide to Naming Their New Child, Arcturus Publishing, London)

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Adeldreda and Aildreda are other forms. Source: https://www.s-gabriel.org/names/talan/reaney/reaney.cgi?Audrey

Also found in the form Etheldred, as if combining Ethel with Mildred or the male name Eldred. Yet Etheldred, without the 'a' after the second 'd', is female only, used in Anglo-Saxon times and again in the 19th century. Both Etheldred and Etheldreda are now out of fashion, but Audrey is the more popular form today.