If you call an Aunt an Ant do you call your mother a "Moth"er? If you call an Aunt an Ant do you pronounce Australia like Aestralia? I fear that the mispronunciation of Aunt comes from the inability of current people's ancestors to read. So very much like the current trend of troglodytes to use double negatives to add emphasis to their statements I am inclined to think that people mispronouncing Aunt as Ant is simply a matter of ignorance of how written English should be pronounced.