Clark Wilhem Griswold Jr.
His middle name is revealed during the opening credits to Euorpean Vacation on his passport.
Eugenie Clark's middle name was "Clark."
Ross
Herbert Hoover's middle name was Clark
Ross
Clark
William
George
Paul Clark McDermott
His full name was Herbert Clark Hoover.
Clark Joseph (sometimes Jerome) Kent. A link to the Wikipedia post is provided.
Paul Clark McDermott
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