[Machine] That he named his eldest son Hamza and named Husayn Jafar after his uncle, so the Messenger of Allah ﷺ named them Hasan and Husayn.
أَنَّهُ «سَمَّى ابْنَهُ الْأَكْبَرَ حَمْزَةَ وَسَمَّى حُسَيْنًا جَعْفَرًا بِاسْمِ عَمِّهِ فَسَمَّاهُمَا رَسُولُ اللهِ ﷺ حَسَنًا وَحُسَيْنًا»
[Machine] "He named his eldest son after his uncle, Hamza, and he named Hussain after his uncle, Jafar. The Messenger of Allah ﷺ called Ali and said, 'I have been commanded to change the names of these two.' Allah and His Messenger know best, so he named them Hasan and Hussain."
أَنَّهُ سَمَّى ابْنَهُ الْأَكْبَرَ بِاسْمِ عَمِّهِ حَمْزَةَ وَسَمَّى حُسَيْنًا بِعَمِّهِ جَعْفَرٍ فَدَعَا رَسُولُ اللَّهِ ﷺ عَلِيًّا فَقَالَ «إِنِّي قَدْ أَمَرْتُ أَنْ أُغَيِّرَ اسْمَ هَذَيْنِ» فَقَالَ اللَّهُ وَرَسُولُهُ أَعْلَمُ فَسَمَّاهُمَا حَسَنًا وَحُسَيْنًا