I think you misread that. Elon Musk IV is the given name. Her full name is Elon Musk IV Musk. The same way Mario's and Luigi's full names are Mario Mario and Lu

I think you misread that. Elon Musk IV is the given name. Her full name is Elon Musk IV Musk. The same way Mario's and Luigi's full names are Mario Mario and Luigi Mario. Her friends call her IV.