I said: Messenger of Allah! tell me if a son is born to me after your death, may I give him your name and your kunyah? He replied: Yes. The transmitter Abu Bakr did not mention the words "I said". Instead, he said: 'Ali said to the Prophet ﷺ.  

عَلِيٌّ رَحِمَهُ اللَّهُ قُلْتُ يَا رَسُولَ اللَّهِ إِنْ وُلِدَ لِي مِنْ بَعْدِكَ وَلَدٌ أُسَمِّيهِ بِاسْمِكَ وَأُكْنِيهِ بِكُنْيَتِكَ قَالَ نَعَمْ وَلَمْ يَقُلْ أَبُو بَكْرٍ قُلْتُ قَالَ عَلِيٌّ عَلَيْهِ السَّلاَمُ لِلنَّبِيِّ ﷺ  

A woman came to the Messenger of Allah ﷺ and said: Messenger of Allah! I have given birth to a boy, and call him Muhammad and AbulQasim as kunyah (surname), but I have been told that you disapproved of that. He replied: What is it which has made my name lawful and my kunyah unlawful, or what is it which has made my kunyah unlawful and my name lawful?  

جَاءَتِ امْرَأَةٌ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالَتْ يَا رَسُولَ اللَّهِ إِنِّي قَدْ وَلَدْتُ غُلاَمًا فَسَمَّيْتُهُ مُحَمَّدًا وَكَنَّيْتُهُ أَبَا الْقَاسِمِ فَذُكِرَ لِي أَنَّكَ تَكْرَهُ ذَلِكَ فَقَالَ مَا الَّذِي أَحَلَّ اسْمِي وَحَرَّمَ كُنْيَتِي أَوْ مَا الَّذِي حَرَّمَ كُنْيَتِي وَأَحَلَّ اسْمِي