WE RELATE FROM the Ṣaḥīḥ of Muslim that Samurah ibn Jundub 
narrated that the Messenger of Allah 
said: “Do not call your son Yasār, Rabāḥ, Najāḥ or Aflaḥ. For you will say: ‘Is he here?’ and when he is not, you will say: ‘No.’ These are only four, so do not add to what I have said.” [1].
narrated that the Messenger of Allah said: “Do not call your son Yasār, Rabāḥ, Najāḥ or Aflaḥ. For you will say: ‘Is he here?’ and when he is not, you will say: ‘No.’ These are only four, so do not add to what I have said.” [1].We relate this from the Sunan of Abū Dāwūd and elsewhere in a narration from Jābir , also containing the prohibition of naming someone Barakah (Blessing). [2].
, also containing the prohibition of naming someone Barakah (Blessing). [2].We relate in the Ṣaḥīḥs of al-Bukhārī and Muslim that Abū Hurayrah reported that the Messenger of Allah said: “The worst, most humiliating name in the sight of Allah, exalted is He, is for a man to call himself Malik al-Amlāk—‘King of kings’”; another narration has akhnā, ‘the foulest’, instead of akhna‘. According to a report by Muslim he said: “The man with whom Allah will be angriest on the Day of Judgment, and the vilest man, is a man who used to be called ‘King of kings’; there is no king but Allah.” [3].
reported that the Messenger of Allah said: “The worst, most humiliating name in the sight of Allah, exalted is He, is for a man to call himself Malik al-Amlāk—‘King of kings’”; another narration has akhnā, ‘the foulest’, instead of akhna‘. According to a report by Muslim he said: “The man with whom Allah will be angriest on the Day of Judgment, and the vilest man, is a man who used to be called ‘King of kings’; there is no king but Allah.” [3].The scholars say that the meaning of akhna‘ (worst, most humiliating) and akhnā (foulest) is ‘lowest’, most base’ and ‘meanest’.
It is narrated in the Ṣaḥīḥ that Sufyan ibn ‘Uyaynah said: “‘King of kings’ is the meaning of [the Persian title] ‘Shāhān Shāh’” [normally written Shāhanshāh].
References
[1] Muslim (2137), Abū Dāwūd (4958) and at-Tirmidhī (2838). Yasār means ‘wealthy’; Rabāḥ means ‘profitable’; Najāḥ and Aflaḥ mean ‘successful’. This means that if someone asks if a person by one of these names is present and he is not, it could be construed as meaning that no-one present has those qualities. People will therefore take this as a bad omen.
[2] Abū Dāwūd (4960) and Muslim (2138).
[3] Al-Bukhārī (6205), Muslim (2143), Abū Dāwūd (4961) and at-Tirmidhī (2839).