The Great Baby Name Mystery of 2008 is history.
According to Nicole Kidman's father, there's a perfectly logical reason the Oscar winner and husband Keith Urban chose the name Sunday Rose for their baby girl, born on Monday.
"There was a lady named Sunday Reed who was a prominent patron of the arts in Victoria," Antony Kidman tells Australia's Daily Telegraph.
"I have read a bit about Sunday Reed and her husband, John—she was a key mover and shaker in the arts around the beginning of the century. The name Sunday struck me as being a nice name for a woman, so my wife and I mentioned it.
"It was among other names being mentioned but they decided that was the name they wanted," he added, without elaboration.
As for the middle moniker, Rose was the name of Urban's late grandmother.