Elon Musk And Girlfriend Grimes Named Their Baby ‘X Æ A-12 Musk’ Elon Musk And Girlfriend Grimes Named Their Baby ‘X Æ A-12 Musk’ Elon Musk and his girlfriend, singer Grimes, have welcomed a baby boy. Before you run out looking for cute monogramed baby items hold up...you won't find any.Lisa MarieLisa Marie