Why did the name Angela Janet Caldwell upset Herman Calloway?

Angela Janet Caldwell was Herman's daughter. She lft home eleven years before, and Herman never heard from her again.

Mr. Jimmy said, "Bud, that's enough. Herman is not your father. But Angela Janet is his daughter's name. If what you're saying is true, Lord help us all, it looks like Herman might be your grandfather."

We think she ran off with one of Herman's drummers.
"We've been hoping for eleven years that she'd send word or come home, and she finally has. Looks to me like she sent us the best word we've had in years."