Playwright's global attack has his signature on it. It reads Raül - sounds appropriate, considering that Phantom's lore was based on Phantom of the Opera, and in the source material, there was a character called Viscount Raoul de Chagny.
What's interesting is that, instead of the French spelling of the name, "Raoul", Playwright uses the Catalan version with the ü, "Raül" - implying that he might have came from southern France, Pyrénées-Orientales. This area is well known for its wine -- It might be relevant that Tragodia is also known as the Wine God.
(also I dug through the game files for 4 hours to get his signature, I'm gonna turn this into a stamp or somehting)