Beyoncé and Jay-Z appear to have named their new twins. The couple have reportedly registered in the US to trademark “Rumi Carter” and “Sir Carter” – as they did regarding their five-year-old daughter, Blue Ivy.

The trademark application was reportedly made from the same California address as that for Blue Ivy. The website TMZ.com reported that the application was made on 26 June, around the time the twins would have returned home from the hospital.

The birth of the twins has not yet been officially confirmed, though it was reported to have happened last month.

Rumi appears to have been chosen in reference to the 13th-century poet and Muslim scholar Jalaluddin al-Rumi, who the Hollywood screenwriter David Franzoni, working on a script about Rumi’s life, said last year was “like a Shakespeare”.

A new Jay-Z track, Marcy Me, contains a reference to Sufi poetry: “I started in lobbies now, parley with Saudis/Sufi to the goofies, I could probably speak Farsi/That’s poetry, read a coca leaf from my past.”

Marcy Me is included on Jay-Z’s new album, 4:44, which contains rumination on his rumoured infidelity, itself the subject of songs on Beyoncé’s Lemonade, released in 2016.