Muhammad bin Abdullah bin Numayr said: Sa'd bin Ubayd's kunyah was Abu Zayd, and he is the one who collected the Qur'an. His son Umayr bin Sa'd was a governor for Sayyiduna Umar (may Allah be pleased with him). And he is Sa'd bin Ubayd bin al-Nu'man.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5468