Meaning and information about Falstaff, What does Falstaff mean? Falstaff means 'King Henry IV, 1 & 2' Prince John, Henry IV's son. 'Henry VI, 1' John Talbot. 'King Henry VI, III' Sir John Mortimer, Sir John Montgomery, and Sir John Somerville. 'King John' The king. 'The Merry Wives of Windsor' Sir John Falstaff. Find similar names like Falstaff.