Their oldest, Sunday Rose, was born on January 7, 2008. Urban once said the reason they chose Sunday as her name is because he felt that Sunday was the loneliest day of the week before he had a family. So by naming their little girl Sunday, the couple knew there would be joy in their lives every single day.
As for their youngest daughter, Faith Margaret, who was born on December 28, 2011, her name is a family name. Margaret was the name of Kidman's late grandmother, who she had a great admiration for.