QUESTION: What is the least common first names for a U.S. President? (The answser is a tie.) COMMON ANSWER: The following presidents have first names that no other president has: Thomas Jefferson, Martin Van Buren, Zachery Taylor, Millard Fillmore, Abraham Lincoln, Ulysses Grant, Dwight Eisenhower, Rutherford Hayes, Chester Author, Grover Cleveland, Benjamin Harrison, Theodore Roosevelt, Woodrow Wilson, Warren Harding, Calvin Coolidge, Herbert Hoover, Harry Truman, Lyndon Johnson, Richard Nixon, Gerald Ford, Ronald Reagan, Barack Obama. Note: Tom, Dick, and Harry, the generic common-first-names, are only represented once. I would have thought that one of them would be a more common American Prez first name then Barak. TRICK ANSWER: All of the names that no president had are tied. I don't know what I think of this one. Seems stupid rather than a trick; however, when I asked this question to someone (expecting the common answer, not even thinking of the trick) they gave me the trick answer.