I think it is respectful to address someone by the name they go by. I have a friend who's named William and would get annoyed if someone kept calling him Willy,

I think it is respectful to address someone by the name they go by. I have a friend who's named William and would get annoyed if someone kept calling him Willy, and goes by Bill. People also get married, and it's respectful and customary to address them by their new name. At the end of the day, I wouldn't want someone making what is probably a tough situation more difficult and hassling me about a name change if I were in that position. I have a really long name, and I'd be annoyed after a while if someone kept addressing me by that name, rather than the shorter name I choose to go by as an adult. None of this is political, it's just being a polite southerner. You treat folks how you want to be treated.