Clark Wilhem Griswold Jr.
His middle name is revealed during the opening credits to Euorpean Vacation on his passport.
Ross
William
denise clark bradford
Maurette Brown Clark's husband's name is Mark Clark...Never really seen him,but heard his name in an article about Maurette.
Leo Clark
Clark Griswold's middle initial is W, which stands for Wilhelm. This character, played by Chevy Chase in the "National Lampoon's Vacation" film series, is known for his humorous and often disastrous attempts at family vacations. The middle name adds to the character's quirky and relatable personality.
Eugenie Clark's middle name was "Clark."
Ross
Herbert Hoover's middle name was Clark
William
Clark
Ross
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