The real name of Boal is "Paul."

He was called "Boal" as a nickname from the moment he was born. It started when his mother began calling him Boal, and people around him followed suit.

Even at school, he is called Boal, and the teachers think that's his real name.
It seems that Boal himself prefers being called Boal.

The official registration, however, is under the name Paul.
When Boal found out about this, he must have been surprised, but as usual, he remained expressionless, while his grandfather was confused.

Boal murmured that he didn't know how to react when he was called Paul at the dentist.