Elon Musk's 13th child, a son with Ashley St. Clair, is named Romulus, revealed the Wall Street Journal. Romulus, in Roman mythology, is the founder of Rome. A paternity test confirmed Musk's parentage with 99.

That list already includes Musk’s first wife, Justine Musk, with whom the Tesla CEO is said to have had six children; “Grimes,” aka Claire Boucher, who has had three children with Musk (including X Æ A-12,