Volume 8, Book 73, Number 206:
Narrated Jabi:
A man among us begot a boy whom he named Al-Qasim. The people said, “We will not call him
(i.e., the father) by that Kuniya (Abu-l-Qasim) till we ask the Prophet about it. The Prophet said.
“Name yourselves by my name, but do not call (yourselves) by my Kuniya.”