Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 4952
Narated By 'Aisha, Ummul Mu'minin : 'Aisha said: Apostle of Allah! All my fellow-wives have kunyahs? He said: Give yourself the kunyah by Abdullah, your son - that is to say, her nephew (her sister's son).
Musaddad said: Abdullah ibn az-Zubayr. She was called by the kunyah Umm Abdullah.