Southern Brits say aunt "aren't" with a touch of"ahhnt".
So of course that's the proper way for everyone in the world to say it, merch. - Fishonabike

Ah yes, merch, one would talk such in the glory days, back before one day the sun sot on an empire misplaced.

In quick keen modern times we have two ways to pronounce
"aunt" developed with economy by the good folks of the central Alabama rural south.

(1) Common, used by poor people both black and white.

AUNT : n. two syllables pronounced ahn-tee.
usage
Proper; That there is my ahn-tee.
Improper; That there is my ahn-tee Ruth.
(too many syllables instead just say, That there is Ruth.)

(2) People of High Culture (wealth): used by both black and white.

AUNT : proper noun and title. one syllable pronounced ain't.
usage
Proper; She is my aint. (meaning she is)
Proper; She is my aint Ruth. (meaning she is indeed Aunt Ruth.