Jay-Z, Beyonce Name Their Twins Rumi and Sir: Report

Welcome to the world, Rumi and Sir Carter, Beyoncé and Jay-Z's newborn twins who were born in mid-June. The twins join their other sibling, five-year-old sister Blue Ivy, in the expanding Carter family. Although the Carters haven't formally announced the twins' names – or even confirmed that Beyoncé had given birth – People reports that the names were uncovered in trademark documents filed to the United States Patent and Trademark Office. 
TMZ also confir