Abu-l-Qasim (The Prophet) said, "Name yourselves by my name, but do not call yourselves by my Kuniya."
Sahih al-Bukhari Book 78, Hadith 212
← Previous Hadith 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 (ﷺ) about it. The Prophet (ﷺ) said. "Name yourselves by my name, but do not call (yourselves) by my Kuniya."

Sahih al-Bukhari Book 78, Hadith 211 Next Hadith → A man among us begot a boy whom he named Al-Qasim. The people said (to him), "We will not call you Abul-l-Qasim, nor will we please you by calling you so." The man came to the Prophet (ﷺ) and mentioned that to him. The Prophet (ﷺ) said to him, "Name your son `Abdur-Rahman."

Sahih al-Bukhari Book 78, Hadith 213