Good Manners and Form (Al-Adab)
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنِ ابْنِ سِيرِينَ، سَمِعْتُ أَبَا هُرَيْرَةَ، قَالَ أَبُو الْقَاسِمِ صلى الله عليه وسلم " سَمُّوا بِاسْمِي، وَلاَ تَكْتَنُوا بِكُنْيَتِي ".Narrated Abu Huraira:Abu-l-Qasim (The Prophet) said, "Name yourselves by my name, but do not call yourselves by my Kuniya
From Sahih al-Bukhari, whose reports the scholars accept as authentic.