Zayd bin Aslam narrates from his father that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) struck a son of his for taking the kunyah Abu Isa. Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) took the kunyah Abu Isa, so Sayyiduna Umar (may Allah be pleased with him) said: "Is it not enough for you to take the kunyah Abu Abdullah?" He replied: "The Messenger of Allah (peace and blessings be upon him) gave me this kunyah." Sayyiduna Umar (may Allah be pleased with him) said: The past and future sins of the Messenger of Allah (peace and blessings be upon him) were forgiven, whereas we are still in our state of uncertainty, not knowing what will become of us. Thereafter his kunyah remained Abu Abdullah until his death.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19332