According to the China Dictionary of Ancient and Modern Surnames edited by Dou Xuetian, when the word "Bai" is used as a surname, it is pronounced as b? oē ib ē ibó, etc. See the scanning of related items in this book for details.
1, BM: O. Page 26 (partial)
2. Page 32 (Part)
3. Page 33 (Part)
4. Page 49 of 4.bó (partial)