Hazrat Mahdi (as) will be spoken of everywhere

In the hadiths it is stated that there will be much discussion of the name of Hazrat Mahdi (as) in his time. And this shows that the name of Hazrat Mahdi (as) will be known all over the world:

When a herald from the sky cries out, "Truth lies with the Family of Muhammad,” Hazrat Mahdi (as) will appear. Everyone will speak of him alone; they will absorb his love and speak of nothing else. (Al-Muttaqi al-Hindi, Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 33)

After a herald from the sky has cried out, “Truth lies with the people of Hazrat Muhammed (saas),” love for Hazrat Mahdi (as) will settle in people’s hearts and they will talk of nothing else. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 20)