Hazrat Ali’s (ra) titles were: Abul Hasan, Abu Sibtain and Abu Turab.
(Ali Ibn al-Athir, Usd al-Ghabah fi Ma‘rifat al-Sahabah, Vol. 4, Dhikr Ali bin Abi Talib [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2003], 87, 88) (Sahih al-Bukhari, Kitab al-Salah, Bab Naum al-Rijal fi al-Masjid, Hadith 441)