According to Abu Dawud and Tirmidhi’s accounts from Ibn Masud, Rasulullah (saas) said: “His name will be compatible with mine, and his father’s name with my father’s name...”1

 “Even if only one day is left to the life of this world, Allah will certainly prolong that day until the coming of a man [Hazrat Mahdi (as)] from the Ahl al-Bayt whose name is compatible with mine.” –narrated in Ahmad Ibn Hanbal’s Musnad.

According to Abdullah Ibn Umar’s (ra) account;
Rasulullah (saas) said: “The world will not come to an end until a man from my Ahl al-Bayt [Hazrat Mahdi (as)] whose name is compatible with mine imposes his rule over all the Arabs.”

According to another account, he said:
“Even if only one day remains from the life of this world, Allah will certainly prolong that day until He sends a man  from my Ahl al-Bayt [Hazrat Mahdi (as)] whose name is compatible with mine. He will fill the world that was previously filled with cruelty and oppression with truth and justice instead.” –related by Tirmidhi, Abu Dawud, Nasai, Bayhaqi and Abu Amr Ad-Dani.

Again according to Abdullah Ibn Umar (ra) he said:
“The world will not come to an end until a man from my Ahl al-Bayt whose name is compatible with mine establishes dominion (on earth). He will fill the world that was previously filled with cruelty and oppression, with truth and justice instead.”  – Related in Abu al-Qasim Sulaiman ibn Ahmad ibn At-Tabarani  “al- Mu’jam As-Saghir.” In addition, Tirmidhi’s “Al-Jami” and Abu Dawud’s “Sunan” by and large repeat this account, with a few minor alterations.

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[1] Portents of Doomsday, Expanded 9th Edition, pp. 159-160