Al-Asma'i (may Allah have mercy on him) said: Abu Umamah al-Bahili, Sudayy bin Ajlan (may Allah be pleased with him), was from a clan called Banu Sahm bin Amr, which is a branch of Banu Qutaybah.
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7427