Narrated 'Ali bin Abi Talib:
that he said: "O Messenger of Allah (ﷺ)! If I have a son after you do you think I could name him your Kunyah?" He said: "Yes." So he said: "So that was permitted for me." (DE)
English reference (DE): Vol. 5, Book 41, Hadith 2843 (DE)
Arabic reference (DE): Book 43, Hadith 3079 (DE)