(108) باب تَحْوِيلِ الاِسْمِ إِلَى اسْمٍ أَحْسَنَ مِنْهُ
Narrated Sa`id bin Al-Musaiyab:
That when his grandfather, Hazn visited the Prophet (ﷺ) the Prophet (ﷺ) said (to him), "What is your name?" He said, "My name is Hazn." The Prophet (ﷺ) said, " But you are Sahl." He said, "I will not change my name with which my father named me." Ibn Al-Musaiyab added: So we have had roughness (in character) ever since.
Reference: Sahih al-Bukhari 6193
In-book reference: Book 78, Hadith 217
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 213