Flamboyant billionaire and tech mogul Elon Musk sired twins with Shivon Zilis in November, an executive at his neurotechnology company Neuralink, Insider reported citing court documents.
According to the media outlet, in April Musk and Zilis filed a petition to change the children’s names to "have their father's surname and contain their mother's surname as part of their middle name."
The order was reportedly approved in May by a judge in Austin, Texas.
The twins, whose names Insider did not disclose so as to protect their privacy, were apparently born weeks before Musk and Canadian musician Claire Boucher (known professionally as Grimes) had their second child.
If the media outlet’s findings are correct, Musk has fathered a total of 10 children so far.
On Thursday, Musk also tweeted: “Doing my best to help the underpopulation crisis. A collapsing birth rate is the biggest danger civilization faces by far.”