Unlucky number thirteen is now an edgy baby name option thanks to Kourtney Kardashian and Travis Barker, who named their son Rocky Thirteen. They chose his one-of-a-kind middle name because "13 is just the greatest number of all time," according to Barker. Rocky is also the 13th Kardashian grandchild.

Number names are cooler than ever and Thirteen is the newest addition, introduced by Kourtney Kardashian and Travis Barker. They named their son Rocky Thirteen, inspired by Travis' favorite number and Rocky's position as the 13th Kardashian grandchild.