The most common first name in world according to the Guinness World Records is "Muhammad".
Time magazine wrote an article on, July 15, 1974, titled "Who were history's greatest leaders?
This quote by Jules Masserman:
Leaders must fulfill three functions: 1) Provide for the well being of the led, 2) Provide a social organization in which people feel relatively secure, and 3) Provide them with a set of beliefs ... People like Pasteur and Salk are leaders in the first sense. People like Gandhi and Confucius, on one hand, and Alexander and Caesar on the other, are leaders in the second and perhaps the third sense. Jesus and Buddha belong in the third category alone. Perhaps the greatest leader of all time was Muhammad, who combined all three functions. To a lesser degree, Moses did the same."
In 1978, an American Michael H. Hart wrote a book titled “The 100 most influential men in history”. Number 1 on his list was Prophet Muhammad (pbuh).
"My choice of Muhammad to lead the list of the world's most influential persons may surprise some readers and may be questioned by others, but he was the only man in history who was supremely successful on both the religious and secular levels."