A man among us begot a boy whom he named Al-Qasim. The people said, "We will not call him (i.e., the father) by that Kuniya (Abu-l-Qasim) till we ask the Prophet ﷺ about it. The Prophet ﷺ said. "Name yourselves by my name, but do not call (yourselves) by my Kuniya."  

وُلِدَ لِرَجُلٍ مِنَّا غُلاَمٌ فَسَمَّاهُ الْقَاسِمَ فَقَالُوا لاَ نَكْنِيهِ حَتَّى نَسْأَلَ النَّبِيَّ ﷺ فَقَالَ سَمُّوا بِاسْمِي وَلاَ تَكْتَنُوا بِكُنْيَتِي  

Abu-l-Qasim (The Prophet) said, "Name yourselves by my name, but do not call yourselves by my Kuniya."  

أَبُو الْقَاسِمِ ﷺ سَمُّوا بِاسْمِي وَلاَ تَكْتَنُوا بِكُنْيَتِي  

A man among us begot a boy whom he named Al-Qasim. The people said (to him), "We will not call you Abul-l-Qasim, nor will we please you by calling you so." The man came to the Prophet ﷺ and mentioned that to him. The Prophet ﷺ said to him, "Name your son ʿAbdur-Rahman."  

سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ ؓ وُلِدَ لِرَجُلٍ مِنَّا غُلاَمٌ فَسَمَّاهُ الْقَاسِمَ فَقَالُوا لاَ نَكْنِيكَ بِأَبِي الْقَاسِمِ وَلاَ نُنْعِمُكَ عَيْنًا فَأَتَى النَّبِيَّ ﷺ فَذَكَرَ ذَلِكَ لَهُ فَقَالَ أَسْمِ ابْنَكَ عَبْدَ الرَّحْمَنِ