The two crossword solutions for the term 'Presidential Surname' are Monroe (6 letters) and ADAMS (5 letters). James Monroe was the fifth President of the United States, serving from 1817 to 1825. He was a Founding Father and is best known for his foreign policy initiatives, such as the Monroe Doctrine. John ADAMS was the second President of the United States, serving from 1797 to 1801. He was a Founding Father and is best known for his role in the American Revolution and for his diplomatic efforts to secure peace with France.