He was the third of four children born to William Bayard Cutting (1850–1912) and Olivia Peyton Murray (1855–1949).
His daughter Lady Sybil Cuffe was the mother of the writer Iris Origo through her first husband William Bayard Cutting.
Lady Sybil Marjorie Cuffe (1879–1943), married (1) 30 April 1901 William Bayard Cutting (Jnr.) (1878- 1910 of tuberculosis), son of William Bayard Cutting and then secretary to the US embassy to the Court of St. James's, by whom she had one daughter Iris Origo (1902–1988).
Origo was the granddaughter of William Bayard Cutting, her mother Lady Sybil Cuffe (daughter of Lord Desart, an Irish peer) having married the diplomat eldest son (also named William Bayard Cutting) of the rich and philanthropic New York family.
In 1907 there were one hundred (100) members including and one honorary member: George Slade, William Bayard Cutting, John Cochrane, Frank Hall, George De Witt, Esq., Daniel Fearing, Frederic Rhinelander, W.K. Vanderbilt, Alfred Wagstaff, Jr., Esq.
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | William Shatner | William Faulkner | William Randolph Hearst | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | William Jennings Bryan | William Gibson | William Wilberforce | William James | William Makepeace Thackeray | Fort William | William Hanna | William Hague | William III | William Hurt | William Walton |
William Bayard Cutting's grandfather, Robert Cutting, had been Robert Fulton's partner in the ferry from Brooklyn to New York; they married sisters who were daughters of Walter Livingston.