He emigrated to the Messenger of Allah ﷺ, who asked him, "What is your name?"He replied, "Zahm."The Prophet said, "Rather, you are Bashir." …the hadith continues.
كان اسم بشير في الجاهلية زحم بن معبد.
فهاجر إلى رسول الله ﷺ فقال: ما اسمك؟ قال: زحم، قال: بل أنت بشير… الحديث.
Abu Dawud (3230), Nasai (2048), and Ibn Majah (1568) narrated it, and Ibn Hibban (3170) graded it sahih, all of them through the route of Aswad bin Shayban, from Khalid bin Samir, from Bashir bin Nuhayk, from Bashir (that is, Ibn Khasasiyah), who mentioned it at length. It is mentioned in the chapter on funerals, and its chain is hasan because of Khalid bin Samir, for he is hasan al-hadith.There is another route for it, narrated by Ahmad (21956) and Bukhari in Adab al-Mufrad (830), both through the route of Ubaydullah bin Iyad bin Laqeet Shaybani, from his father, from Layla the wife of Bashir Ibn Khasasiyah, from Bashir, who said that he had come to the Prophet ﷺ and said, "My name is Zaham," so the Prophet ﷺ named him Bashir. Ubaydullah bin Iyad is truthful.