From Sahih Bukhari (Hadith 3114):
Narrated Jabir bin 'Abdullah (ra):A boy was born to one of our men, the Ansar, and he wanted to name him Muhammad. The Ansari man said, "I took the boy to the Prophet (ﷺ). The Prophet (ﷺ) said, "Name your child by my name, but do not name (them) by my Kunya, for I have been made Qasim (i.e., a distributor) to distribute (the booty etc.) amongst you." The narrator, Husain said that the Prophet (ﷺ) said, "I have been sent as a Qasim (i.e., distributor) to distribute (things) amongst you." [The Sub narrator Salim said that he heard Jabir saying that the man wanted to name the boy Al-Qasim, but the Prophet (ﷺ) said, "Call (your sons) by my name, but do not name (them) by my Kunya
Reference: Bukhari 3114