One of my friends is a professional zither player in Germany. One day as we were preparing to give a concert, someone came by and almost jokingly said to me “We’ll see you later, Mr. Zither!”
My friend was a bit upset and told me that I really could not use that name because that was his stage name. Now, I had never used the name “Mr. Zither”, but now realized that I could not use it. I thought for a moment and then told my friend, “Listen, you continue using the “Mr. Zither” name. I have my Ph.D., so I will be “Doctor Zither”.
And the rest, as they say, is history!