Over the years, there have been a number of people who call me, Garry. I simply correct them. It's an honest mistake. Of that number, there are a few who insist on calling me Garry, which is not my name. And eventually, I just go along to get along because they're plain stupid.
There is historical precedent for this.
President/General Ulysses Grant's parents named him Hiram but called him by his middle name, Ulysses, or "Lyss" for short. When he entered West Point in 1839, his name was mistakenly changed to U. Simpson. He then became known as U.S. Grant, rather than H.U. Grant, which stood for the initials for his given name, Hiram Ulysses.
I'm not saying that I'm in President Grant's league. I don't smoke cigars incessantly and drink rot-gut whiskey so I'm obviously NOT Grant's reincarnation...neither do I wear a beard...at present.