I did see that
Audrey was used among British nobility (there was a lady named
Audrey Young who became a duchess by marriage) but not in the actual royal family. I think I do agree that
Audrey may come across as informal and untraditional but looking at the names that the current British royals are giving to their children, I think
Audrey could definitely be a choice that could work. The name "
Audrey" fits their heritage and is both classic and current.
I like Atheldreda with the nickname
Audrey - that would be nice. I was thinking maybe that "
Edie" could work for
Etheldreda.