EXCLUSIVE: Find Out the Name of Carey Mulligan and Marcus Mumford's Baby Girl

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After Carey Mulligan revealed that she had given birth to a baby girl, the actress is spilling the beans on the name!

The 30-year-old actress revealed to ET’s Carly Steel at Monday’s New York premiere of Suffragette that she and husband Marcus Mumford, frontman of Mumford & Sons, have named their newest addition, Evelyn.

But don’t expect there to be a story behind the name -- the British star admitted that she “just came up with it” on the fly.

WATCH: Carey Mulligan Confirms Birth of Her First Child

Mulligan confirmed reports that she had given birth to her first child during an appearance on the British talk show The Graham Norton Show.

“It is a girl and she’s three weeks old,” she added.

Mulligan and Mumford, 28, have been married since April 2012. Mulligan's pregnancy was first reported back in June.

In an interview with Elle U.K., Mulligan was excited about  her impending motherhood.

"I've always wanted to be a mother," she told the mag. "I love what I do, but I'm excited for this next phase of my life."