How did George McClellan get his nickname?

George McClellan earned the nickname "Little Mac" due to his relatively short stature and his last name, which is often associated with the term "Mac" as a diminutive. The nickname was popularized by soldiers and the media during the American Civil War, reflecting both his physical appearance and a sense of affection or camaraderie. Despite his military talents, he is often remembered more for his cautious approach than for decisive victories.