Can you explain the origin of the name 'Sai Baba' and how Maharaj came to be known by it?

The name 'Sai Baba' originated from his very first encounter in the village of Shirdi. As documented in Chapter 0, when Maharaj arrived with a wedding procession, he went into the Khandoba temple. There, a resident named Mhalasapati, who was a goldsmith, greeted him with the words "Aavo Sai Baba," which means "Come, Sai Baba." Maharaj embraced this name, and it remained with him for the rest of his life. The text notes that most of his devotees called him Sai Baba, and he even identified himself as such when his testimony was taken in a commission, stating, "They call me Sai Baba."