either changed it completely - by deed poll or whatever, or asked to be known as their middle name instead of their first name.
If they did this, would you still call them what you had chosen or would you respect their choice and go with what they wanted to be known as?
Does it depend on what name they choose?
Does it depend on what age they are when they make the decision?
I'm not talking about children playing around and using their imagination, I am talking about a child or an adult that is desperately unhappy with their name and makes a forever decision to change it...