Grant's real name was Hiram Ulysses Grant. However, when he was nominated for West Point, the Congressman who nominated him, wrote his name as Ulysses S. Grant, presumably thinking his middle name was Simpson, which was his mother's maiden name. He never corrected his name with West Point, was commissioned as Ulysses S.Grant and that became his official army name. Maybe he did not like is old initials of HUG.