What did the "D. W." in director D. W. Griffith's name stand for?

“D. W.” in director D. W. Griffith’s name stands for David Wark (1874-1948).

For what magazine did Macauley Connor work in The Philadelphia Story (1940)? Macauley Connor worked for Spy magazine in The Philadelphia Story.
What is the name of the fictitious soap opera in Soap-dish (1991)? The name of the fictitious soap opera in Soap-dish was "The Sun Also Sets."
What part did future director John Ford play in The Birth of a Nation (1915)? John Ford played a Ku Klux Klan member in The Birth of a Nation.
Did Alfred Hitchcock ever direct a costume drama? Yes, AlfredHitchcock directed two costume dramas, Jamaica Inn (1939), and Under Capricorn (1949), both set in the nineteenth century. Hitchcock once said he didn't like to direct historical movies because he couldn't "imagine…
How many films did John Wayne direct? John Wayne directed two films. He directed The Alamo (1960) and codirected The Green Berets (1968) with Ray Kellogg and (uncredited) Mervyn LeRoy. Wayne also directed some scenes (uncredited) of The Comancheros (1961,…
What was Paul Newman’s directorial debut? Rachel, Rachel (1968) was Paul Newman's directorial debut. The movie starred his wife, Joanne Woodward.