(357) بَابُ تَحْوِيلِ الاسْمِ إِلَى الاسْمِ
Sahl said, "Al-Mundhir ibn Abi Usayd was brought to the Prophet,may Allah bless him and grant him peace, when he was born and the Prophetplaced him on his thigh while Abu Usayd was seated near him. The Prophet,may Allah bless him and grant him peace, was busy with something in frontof him, so Abu Usayd told someone to take his son from the Prophet's leg.When the Prophet, may Allah bless him and grant him peace, became awareof it, he asked, 'Where is the child?' Abu Usayd replied, 'We sent himhome.' The Prophet asked, 'What is his name?' He replied, 'Such-and-such.'The Prophet said, 'No, rather his name is al-Mundhir.' So we called himal-Mundhir from that day."
Reference: Al-Adab Al-Mufrad 816
In-book reference: Book 34, Hadith 6
English translation: Book 34, Hadith 816