Who was Chandbhai's guru, and what was his name before being called Sai Baba?

The provided text does not identify a guru for Chandbhai. Instead, it describes Chandbhai's first encounter with the figure who would become Sai Baba. As for his original name, the Introduction (Chapter 0) does not mention it. It notes that when his testimony was taken in a commission and he was asked his name, he simply replied, 'They call me Sai Baba.' He received this name from a gentleman named Mhalasapati, who welcomed him into the Khandoba temple with the words 'Aavo Sai Baba,' a name that he held for the rest of his life.