Conversation so far:
How did Lapu-Lapu get Lapu-Lapu's name?
CANNOTANSWER.
What was his real name?
One oral tradition is that the Sugbuanons of Opong was once ruled by datu named Mangal and later succeeded by his son named Lapu-Lapu.

Question: What else do we know about him?
Self-contained rewrite: What else do we know about Lapu-Lapu other than what is from the oral traditions?