Volume 8, Book 73, Number 208:
Narrated Jabir bin ‘Abdullah:
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 and
mentioned that to him. The Prophet said to him, “Name your son ‘Abdur-Rahman.”