A court document petitioning to change the babies' last names to Musk revealed the births. Zilis is the director of operations and special projects at Musk's Neuralink startup. Prior to that, she served as a project director at Tesla. She gave birth to the twins just weeks prior to the arrival of Musk and Grimes' second child born via surrogate, Insider reported. International Business Times was not able to independently verify this report.

Elon Musk fathered two children in 2021 with Shivon Zilis, a top executive at his artificial intelligence company Neuralink, new court documents show. The world's wealthiest man now has nine known children, including five children with his first wife, Justine Musk, and two with the singer Claire Boucher, known professionally as Grimes. Court documents obtained by Insider and published on Wednesday showed that Elon Musk and Zilis filed a petition to change their twin babies' names to "have their father's last name and contain their mother's last name as part of their middle name". The petition was filed in Austin, Texas, where the babies were born, and was approved by the judge. Zilis reportedly gave birth in November 2021, weeks before Musk and Boucher had their second child via a surrogate.