The Mahdī will lead all Arabs
the Messenger of Allah ﷺ said, "The world shall not pass away until a man from the people of my family rules the Arabs whose name agrees with my name."
قَالَ رَسُولُ اللَّهِ ﷺ: «لاَ تَذْهَبُ الدُّنْيَا حَتَّى يَمْلِكَ الْعَرَبَ رَجُلٌ مِنْ أَهْلِ بَيْتِي يُوَاطِئُ اسْمُهُ اسْمِي۔»