'Sir' and 'Rumi': Are these Beyoncé and Jay-Z's twins' names?

Friday was a big day for Beyoncé and JAY-Z: The rapper's much-anticipated latest music dropped to widespread acclaim and legal documents emerged suggesting they may have chosen unusual names for their newborn twins (whose birth is still officially unconfirmed).

The golden couple isn't confirming names, either, but their lawyer filed trademark documents with the U.S. Patent and Trademark Office, seeking the rights to the words "Sir Carter" and "Rumi Carter." Shawn Carter is JAY-Z's real name.

The applicant was listed as BGK Trademark Holdings LLC, the couple's company that owns the trademarks to their names. (The initials are for Beyoncé Giselle Knowles, her full name.)

Among the goods and services listed as being covered by the newly trademarked names are baby teething rings, baby carriages and baby strollers, plus such items as cosmetic products, books, bags, key chains, mugs, clothing and online video games.

TMZ made the leap from the documents to concluding these are the names of the twins (a boy and a girl), born earlier this month according to People, CNN and US Weekly. Beyoncé's father, Mathew Knowles, confirmed the baby news on Father's Day with a tweet from "Granddad" saying, "They're here! Happy birthday to the twins!"

Neither Beyoncé, 35, nor JAY-Z, 47, has confirmed the birth or the names, nor even whether they've left the Los Angeles hospital where they were born. The lawyer listed on the documents, entertainment attorney Jonathan D. West, did not return a call from USA TODAY.

Sir and Rumi would be unusual monikers, even for a couple who gave their first child the name Blue Ivy. Rumi is a Japanese girl's name, and also was the name of a famous 13th-century Persian poet and Islamic scholar-theologian. Sir is best known as the title for a knight in the United Kingdom, where Queen Elizabeth II annually creates dozens of new knights every year.

JAY-Z's new album, 4:44, released at midnight Friday on Tidal, is a being described as an explosive response to Bey's Lemonade, and a meditation on his fame, wealth, troubled upbringing and experience as a black man in America.

It should help add to the couple's bottom line. Forbes reported in May that it estimates the couple's combined wealth to be $1.16 billion.