Ulysses S. Grant
When Grant arrived at West Point and discovered that the academy had him registered under the wrong name as "Ulysses S. Grant". He was told that it didn't matter what he or his parents thought his name was, the official government application said his name was "Ulysses S." and that application could not be changed. If "Hiram Ulysses Grant" wanted to attend West Point, he would have to change his name.