That his father (Hazn bin Wahb) went to the Prophet ﷺ and the Prophet ﷺ asked (him), "What is your name?" He replied, "My name is Hazn." The Prophet ﷺ said, "You are Sahl." Hazn said, "I will not change the name with which my father has named me." Ibn Al-Musaiyab added: We have had roughness (in character) ever since. Narrated Al-Musaiyab: on the authority of his father similarly as above (i.e., 209).  

أَنَّ أَبَاهُ جَاءَ إِلَى النَّبِيِّ ﷺ فَقَالَ مَا اسْمُكَ قَالَ حَزْنٌ قَالَ أَنْتَ سَهْلٌ قَالَ لاَ أُغَيِّرُ اسْمًا سَمَّانِيهِ أَبِي قَالَ ابْنُ الْمُسَيَّبِ فَمَا زَالَتِ الْحُزُونَةُ فِينَا بَعْدُ حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ وَمَحْمُودٌ قَالاَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ عَنِ الزُّهْرِيِّ عَنِ ابْنِ الْمُسَيَّبِ عَنْ أَبِيهِ عَنْ جَدِّهِ بِهَذَا