Hadith 1908
´'Abdullah bin Amr narrated that:` the Prophet said: "Merely maintaining the ties of kinship is not adequate. But connecting the ties of kinship is when his ties to the womb are severed and he connects it."
Hadith 2843
´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."