Abu Dawud
Sacrifice
Book Number: 009 / Hadith Number: 2832
Narated By Samurah ibn Jundub : The Prophet (pbuh) said: A boy is in pledge for his Aqiqah, Sacrifice is made for him on the seventh day, his head is shaved and he is given name.
Abu Dawud said: The word wa yusamma is sounder as narrated by Salam b. Abi Muti' from Qatadah, and narrated by Iyas b. Daghfal and Ash'ath from al-Hasan who narrated wa yusamma (and he is given a name).