What is the most popular first name among presidents? The answer isn't Tom, Dick or Harry. It's James. Six presidents share that first name— Madison, Monroe, Polk, Buchanan, Garfield and Carter (the first president to use his nickname). Tied for second place are William with four — Harrison, McKinley, Taft and Clinton— and John with four— Adams, Quincy Adams, Tyler and Kennedy. Massachusetts is the birth state of three presidents named John— John Adams, John Quincy Adams and John F. Kennedy.