In July 2022, it was revealed that Tesla founder Elon Musk had secretly welcomed twins a year prior with Shivon Zilis, an executive at Elon’s company Neuralink. At the time, no further information on the children was shared. Now, more than a year later, the twins names have been revealed.

News of Elon’s eighth and ninth children was revealed following court documents filed by the couple in Texas, which is where the twins were born. The two were born in November 2021, but at the time, personal information was redacted from the documents. In a recent interview with TIME magazine promoting his upcoming biography written by Walter Isaacson, the names of Elon’s twins was shared, including an image of the twins with their parents. Elon and Shivon named their twins Strider and Azure.

The SpaceX founder has ten children in total, but the twins are the only children he shares with Shivon. Shortly after the twin’s birth, he welcomed his second baby via surrogate with singer Grimes in December 2021, a daughter whom they call Y, though the name they announced was Exa Dark Sideræl. The couple welcomed their first baby, a son named X Æ A-Xii, who goes by X, in 2020.

In addition to his four younger children, he is also a father to Vivian, Griffin, Damien, Kai, and Saxon. He also had a son named Nevada who passed away from sudden infant death syndrome at 10 weeks old.

Practicing martial arts with my sparring partner pic.twitter.com/bifsH2Mejs

— Elon Musk (@elonmusk) August 12, 2023