Muhammad bin Ishaq, in listing the names of the Ansar who were present at Badr, then from Banu Umayyah bin Zayd, mentions Uwaym bin Sa'idah - Ibn Ishaq did not give his lineage - and says: He was an ally of Banu Amr bin Awf, and it is also said that he was one of them himself.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14419