It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: I said to the Prophet Muhammad (peace and blessings be upon him): O Messenger of Allah! All your other wives have a kunyah (honorific title), so the Prophet (peace and blessings be upon him) said to me: You may take the kunyah of Umm Abdullah. In another narration, he said: Take the kunyah after your son Abdullah. Thus, Sayyida Aisha was called Umm Abdullah until her death, even though she had no children.