Her twin brother is named Sir. Her older sister, Blue Ivy Carter, was born in 2012. Family Life. Before Fame. Her aunt Solange Knowles is also a renowned R&B singer like her mother. According to People Magazine, the names ‘Rumi Carter’ and ‘Sir Carter’ were given a US trademark much like their older sister’s, Blue Ivy Carter. He just came out, like, Sir”, he said. His mother announced she was pregnant with him and his sister in a February 2017 Instagram photo. About. (So they share a birthday with Chris … One of the renowned Carter twins, he and his twin sister, Rumi, are the children of international singing sensation Beyonce and rap superstar Jay Z. He carries himself like that. Her name was purportedly inspired by the Sunni Muslim poet Jalauddin Rumi. Associated With. Copies of the birth certificates in hand, TMZ confirms Beyoncé and Jay-Z welcomed Sir and Rumi on June 13, 2017. Rumi, the girl, they named after their favorite poet while Sir, “Sir was like, man, come out the gate.