Urwah (may Allah have mercy on him), in naming those of the Ansar who took part in Badr, said: Then from Banu Mazin bin al-Najjar, then from Banu Khansa bin Mabdhul bin Amr bin Ghanm bin Mazin: Umayr, whose kunyah was Abu Dawud, bin Amir bin Malik bin Khansa bin Mabdhul (may Allah be pleased with him) (also took part).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14184