Her name is Rosalind Arusha Arkadina Altalune Florence Thurman-Busson but her mum, Uma Thurman, would like loved ones to refer to her daughter as 'Luna'.
The 42-year-old actress and her partner Arpad Busson welcomed their new arrival three months ago, and decided not to reveal the baby's name to the public initially - perhaps because they were learning to get it right?!
But it was revealed yesterday: "I would like to announce Uma and Arki's daughter's name for the first time officially: Rosalind Arusha Arkadina Altalune Florence Thurman-Busson, better known to family and friends as Luna," Uma's representative Gabrielle Kachman told People magazine.
Apparently the baby's long name is very personal for the parents. Uma and Arpad chose each moniker to honour something deeply significant in their lives.
"Each of the five given names has a special reason and meaning to her mother and father," Gabrielle explained.
Uma has two children with far fewer names from her marraige to Ethan Hawke: Maya, 14, and 10-year-old Levon. Uma and Arpad have been together since 2007, although they briefly split in 2009.