THIS MIGHT SURPRISE YOU
The answer
Not in the Bible. Acts 9 gives the light, the voice, the blindness, and Ananias — but no new name. He stays "Saul" for four more chapters, until Acts 13:9 mentions, in passing, "Saul, also known as Paul."
Why it’s interesting
When scripture means a renaming, it says so — Abram becomes Abraham, Jacob becomes Israel, with announcements. Saul-and-Paul is the ordinary two-name life of a Jew in the Roman world: a Hebrew name and a Roman one, likely both his from birth.
Scholarly consensus
You can know the Bible.
Not just the stories, but the history, authorship, and scholarship behind it.