《隋书·列传·卷二十六》
他家本姓破野头，归鲜卑俟豆归奴役，后来随他家的主子姓宇文。
本姓破野头，役属鲜卑俟豆归，后从其主为宇文氏。
His family's original surname was Ponyetou. He surrendered to and became the slave of the Xianbei chieftain Dou Gui Nu, and later took the surname Yuwen after his master.