(7) بَابُ قَوْلِ اللَّهِ تَعَالَى: {فَأَنَّ لِلَّهِ خُمُسَهُ}
Narrated Jabir bin `Abdullah Al-Ansari:
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 Allah's Messenger (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."
Reference: Sahih al-Bukhari 3115
In-book reference: Book 57, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 53, Hadith 345