Which to me is the most classic form of the name.
Audra looks like someone thought "A name ending in the -ey-sound must be a nn, therefore the formal form of
Audrey must be
Audra".
"But it’s all right now.
I learned my lesson well.
You see you can’t please everyone
So you got to please yourself."
Rick Nelson,
Garden Party
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)