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Elon Musk at the Met Gala in New York in May
Photo: ANDREW KELLY / REUTERS
According to a media report, Elon Musk and Shivon Zilis have been parents of twins since November.
Musk and Zilis filed a request in April to have the children's names changed to "take their father's last name," Business Insider reported Wednesday, citing court documents.
A month later, a judge in Texas approved the request.
Zilis, 36, is the director of Musk's brain chip startup Neuralink.
The relationship becoming known could be problematic for the 51-year-old Musk.
Most US companies the size of Tesla and SpaceX prohibit romantic relationships across two hierarchical levels.
Zilis is also being considered as one of the people Musk could hire to run Twitter following his $44 billion acquisition, the report said.
Her career includes positions at Neuralink, Tesla and OpenAI, citing her now-deactivated LinkedIn profile.
All three companies have close ties to Musk, who founded Neuralink, co-founded OpenAI, and took over as CEO of Tesla in 2008.
According to the Reuters news agency, it tried to get a statement from Musk and Zilis.
However, this has so far been unsuccessful.
Business Insider also tried in vain to comment.
The birth of the twins in November would bring Musk's total children to nine.
Musk and Canadian singer Grimes welcomed their second child via surrogate last December.
Musk has five other children from his first marriage.
He was married to Canadian author Justine Wilson from 2000 to 2008.
The couple had twins and triplets.
It wasn't until the end of June that one of Elon Musk's children made headlines: According to court documents, it wanted to have its name changed - to have its identity recognized as a woman and to distance itself from the famous father.
A few days ago, Musk tweeted a photo of his meeting with the Pope;
it also showed four of his children.
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