Musannaf Ibn Abi Shaybah 27590 — Those who permitted taking the kunyah

Muhammad bin al-Hanafiyyah said that Sayyiduna Ali (may Allah be pleased with him) said to the Prophet (peace and blessings be upon him): "If a son is born to me after you (peace and blessings be upon him), may I name him after your name (peace and blessings be upon him) and give him your kunya (peace and blessings be upon him)?" He (peace and blessings be upon him) said: "Yes."