Elon Musk has revealed that he has a third child with singer Grimes.
That 52-year-old billionaire entrepreneur shared the news in her new bio — and went on to confirm her new baby’s name of X.
The little boy is called Techno Mechanicus, or Tau for short.
The word tau means several things, including the 19th letter of the Greek alphabet, the 19th star in a constellation, and a type of unstable subatomic particle.
The child’s age was not disclosed.
The owner of X, formerly known as Twitter, and the founder of SpaceX and Tesla already has two children with Grimes, 35, whose real name is Claire Boucher.
They call them X and Y for short, which are also the names of electric cars made by Musk’s company Tesla.
The couple – who have an on-off relationship – have so far reported the arrival of their children several months after their births.
The biography of Musk – entitled Elon Musk – was written by the American writer and journalist Walter Isaacson, who shadowed the technology boss for two years.
Musk is a father of 11 children, but lost his firstborn child to sudden infant death syndrome (SIDS) when he was just 10 weeks old.
He has been married three times, twice to Westworld star Talulah Riley and once to Canadian author Justine Wilson.