On Friday, Jay-Z revealed why to Rap Radar hosts Elliot Wilson and Brian Miller.
"Rumi is our favorite poet, so it was for our daughter," the rapper explained.
Many people speculated the name Rumi was inspired by the 13th-century poet because Beyoncé's mother, Tina Knowles, had posted a poem by Rumi on Instagram back in July. See her post below:
As for the couple's son, Jay-Z said "Sir was like, man, come out the gate. He carries himself like that. He just came out, like, Sir."
Jay-Z also discussed how Blue Ivy's freestyle came about on 4:44. "She got the headphones and she climbed on the little stool, and then she just started rapping."
There we have it, Bey fans!