I think the most definitive difference in regions is what they call carbonated beverages.
I was born and raised in the Florida Panhandle and the most common usage was to call all of them Cokes tho some real old timers used to say Co-Colas. “Soft Drinks” is also common as is just naming the exact one such as “A Dr. Pepper”.
My late wife was from Oklahoma and she called everything “Pop”. Other places used different names.
BTW, I say pecan as in Kahn with the emphasis on the “Pe”. I was talking to a little cutie who was born not that far away in South Georgia and I noticed she pronounced it the same was except it was “Can”.
In Texas, soft drinks are cokes and pee-cans are what you take on long rides.