Sahih Bukhari

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