Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ahmad:14973ʿAbd al-Razzāq > Maʿmar > Manṣūr > Sālim b. Abū al-Jaʿd > Jābir b. ʿAbdullāh > Wulid Lirajul from al-Anṣār Ghulām Fasammāh al-Qāsim

[Machine] A man from the Ansar had a son, and he named him Al-Qasim. The Ansar said, "By Allah, we will never call you by that name." This news reached the Messenger of Allah ﷺ, and he praised the Ansar greatly. Then he said, "You may call yourselves by my name and do not use my nickname."  

أحمد:١٤٩٧٣حَدَّثَنَا عَبْدُ الرَّزَّاقِ حَدَّثَنَا مَعْمَرٌ عَنْ مَنْصُورٍ عَنْ سَالِمِ بْنِ أَبِي الْجَعْدِ عَنْ جَابِرِ بْنِ عَبْدِ اللهِ قَالَ

وُلِدَ لِرَجُلٍ مِنَ الْأَنْصَارِ غُلَامٌ فَسَمَّاهُ الْقَاسِمَ فَقَالَتِ الْأَنْصَارُ وَاللهِ لَا نُكَنِّيكَ بِهِ أَبَدًا فَبَلَغَ ذَلِكَ رَسُولَ اللهِ ﷺ فَأَثْنَى عَلَى الْأَنْصَارِ خَيْرًا ثُمَّ قَالَ تَسَمَّوْا بِاسْمِي وَلَا تَكَنَّوْا بِكُنْيَتِي