Hadith 17:988
Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hisham, from a freed slave of al-Zubayr, from Aisha: That she said to the Prophet, may Allah bless him and grant him peace: "O Messenger of Allah, all of your wives have been given a kunya (patronymic) except for me." He said: "Then you are Umm Abdullah."
حدثنا أبو بكر قال حدثنا وكيع عن هشام عن مولى للزبير عن عائشة أنها قالت للنبي صلى الله عليه وسلم يا رسول الله كل أزواجك قد كنيته غيري قال فأنت أم عبد الله