What does the word "white" mean when it is pronounced as a surname?

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 bƔ 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)