Hamzah bin Suhayb (may Allah have mercy on him) narrated from his father, Sayyiduna Suhayb (may Allah be pleased with him), that Umar bin al-Khattab (may Allah be pleased with him) said to him: O Suhayb, you have taken a kunyah though you have no son, and you trace your lineage to the Arabs though you are a man from the Romans. He said: "O Commander of the Believers, as for your saying that I have taken a kunyah though I have no son, the Messenger of Allah (peace and blessings be upon him) gave me the kunyah Abu Yahya. And as for your saying that I trace my lineage to the Arabs though I am a man from the Romans, I am a man of the tribe of al-Namir bin Qasit; I was taken captive from Mosul after I had already come to know my family and my lineage."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7279