The vilest names in Allah’s sight on the Day of resurrection will be that of a man called Malik al-Amlak.

Abu Dawud said: This tradition has also been transmitted by Shu'aib b. Abi Hamzah from Abi al-Zinad through different chain of narrators. This version has the words "akhna' ismin" (most obscene name) instead of "akhna ismin" (the vilest name).
Sunan Abi Dawud Book 43, Hadith 189
← Previous Hadith The Prophet (ﷺ) said: If I survive (God willing), I shall forbid my people to give the names Nafi' (beneficial), Aflah (successful) and Barakah (blessing). Al-A'mash said: I do not know whether he mentioned Nafi' or not. When a man comes and asks: Is there Barakah (blessing)? The people say: No.

Abu Dawud said: A similar tradition has been transmitted by Abu al-Zubair on the authority of Jabir from the Prophet (ﷺ) through a different chain of narrators. This version has no mention of Barakah.

Sunan Abi Dawud Book 43, Hadith 188 Next Hadith → This verse was revealed about us, the Banu Salimah: "Nor call each other by (offensive) nicknames: ill-seeming is a name connoting wickedness (to be used of one) after he has believed." He said: When the apostle of Allah (ﷺ) came to us, every one of us had two or three names. The Messenger of Allah (ﷺ) began to say: O so and so! But they would say: Keep silence, Messenger of Allah! He becomes angry by this name. So this verse was revealed: "Nor call each other by (offensive) nicknames."

Sunan Abi Dawud Book 43, Hadith 190