Angelina Jolie and Brad Pitt “have proven once again that they are the leaders in original baby-naming, even by Hollywood standards,” baby name expert Pamela Redmond Satran, coauthor of Cool Names and The Baby Name Bible, tells Usmagazine.com.

The actress, 33, gave birth to twins Knox Leon and Vivienne Marcheline at the Fondation Lenval hospital in Nice, France on Saturday.

“Vivienne is the French version of the ancient Latin name that means ‘alive,’” Satran explains. A common English variation is Vivian, which was the name of Julia Roberts’ character in Pretty Woman.

Except for Rosie O’Donnell’s daughter Vivienne, the name “has not been on the fashion scope in the U.S.,” Satran adds.

Jolie and Pitt’s choice of Knox will boost its popularity among new parents, Satran predicts, “the same way they have with all their other children’s names.”

Knox – Pitt’s grandfather’s middle name – also “matches” big brothers Maddox and Pax as a name that ends in X, Satran points out.

As for middle names, Marcheline was the name of Jolie’s mother, who died of cancer last year, while Leon is Jolie’s great-great grandfather’s name.

Satran gives Jolie and Pitt credit for their name choices.

“I applaud Brad and Angelina for being truly creative in a way that many other parents – celebrities and the rest of us – claim they want to be but aren’t brave or individualistic enough to really achieve,” she says.

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