From Sahih Muslim (Hadith 5595):
Jabir b. 'Abdullah reported:A child was born in the house of a person amongst us, and he gave him the name of Qasim. We said: We will not allow you (to give the name) to your child as Qasim (and thus adopt the kunya of Abu'l-Qasim) and coal your eyes. He (that person) came to Allah's Apostle (ﷺ) and made a mention of that to him, whereupon he said: Call your son 'Abd al-Rahman
Reference: Muslim 5595