Unless I'm mistaken, I think we all agree on what "Don" sounds like.
The real disagreement is with the pronunciation of "Dawn," and there will never be a consensus because it absolutely depends on where you live. I had to go to Boston for work several years ago, and a guy there kept raving about this hot new intern "Don" ...
I made sure he was talking about a female, and finally, only after he WROTE her name did I realize it was "Dawn" he was saying.
Now, I live only one state over from this guy, yet our dialect is completely different.