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This is the case for my area too. It's almost unheard of for a crisp T to be used, it's almost always turned into a D sound. I think it's just the accent, it would sound absurd to us to clearly enunciate the T. That's why names like Letty and Lottie don't work well here, they would become Leddy and Loddie.
Huh, I didn't realize Betty was pronounced with a T sound either. Isn't the Betty character on Riverdale pronounced like a D?
I've never heard of any names with a t pronounced with a d before