A man at Al-Baqi' called, "O Abul-Qasim!" The Prophet ﷺ turned to him and the man said (to the Prophet ), "I did not intend to call you." The prophet said, "Name yourselves by my name but not by my Kunya (name).  

عَنْ أَنَسٍ ؓ دَعَا رَجُلٌ بِالْبَقِيعِ يَا أَبَا الْقَاسِمِ فَالْتَفَتَ إِلَيْهِ النَّبِيُّ ﷺ فَقَالَ لَمْ أَعْنِكَ قَالَ سَمُّوا بِاسْمِي وَلاَ تَكْتَنُوا بِكُنْيَتِي  

A man amongst us begot a boy whom he named Al-Qasim. On that the Ansar said, (to the man), "We will never call you Abu-al-Qasim and will never please you with this blessed title." So, he went to the Prophet and said, "O Messenger of Allah ﷺ! I have begotten a boy whom I named Al-Qasim and the Ansar said, 'We will never call you Abu-al-Qasim, nor will we please you with this title.' " The Prophet ﷺ said, "The Ansar have done well. Name by my name, but do not name by my Kunya, for I am Qasim."  

وُلِدَ لِرَجُلٍ مِنَّا غُلاَمٌ فَسَمَّاهُ الْقَاسِمَ فَقَالَتِ الأَنْصَارُ لاَ نَكْنِيكَ أَبَا الْقَاسِمِ وَلاَ نُنْعِمُكَ عَيْنًا فَأَتَى النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ وُلِدَ لِي غُلاَمٌ فَسَمَّيْتُهُ الْقَاسِمَ فَقَالَتِ الأَنْصَارُ لاَ نَكْنِيكَ أَبَا الْقَاسِمِ وَلاَ نُنْعِمُكَ عَيْنًا فَقَالَ النَّبِيُّ ﷺ أَحْسَنَتِ الأَنْصَارُ سَمُّوا بِاسْمِي وَلاَ تَكَنَّوْا بِكُنْيَتِي فَإِنَّمَا أَنَا قَاسِمٌ  

A boy was born for a man among us, and the man named him Al-Qasim. We said to him, "We will not call you Abu-l-Qasim, nor will we respect you for that." The Prophet ﷺ was informed about that, and he said, "Name your son ʿAbdur-Rahman."  

وُلِدَ لِرَجُلٍ مِنَّا غُلاَمٌ فَسَمَّاهُ الْقَاسِمَ فَقُلْنَا لاَ نَكْنِيكَ أَبَا الْقَاسِمِ وَلاَ كَرَامَةَ فَأَخْبَرَ النَّبِيَّ ﷺ فَقَالَ سَمِّ ابْنَكَ عَبْدَ الرَّحْمَنِ  

Abu-l-Qasim said, "Name yourselves after me, but do not call yourselves by my Kuniya."  

أَبُو الْقَاسِمِ ﷺ سَمُّوا بِاسْمِي وَلاَ تَكْتَنُوا بِكُنْيَتِي