deepanddark20 said:
"Darth" is clearly a name, not a title, in A New Hope (e.g. "only a master of evil Darth", "you can't win Darth", etc.).
But that's not clear at all. Sure it makes sense if you read those lines with the idea that Darth is his first name. But they make just as much sense if you read it as his title. Replace "Darth" with a title such as "Captain", "Doctor", or "Commander" and they still make perfect sense. There is no firm evidence in the OT one way or the other for determining if Darth is a name or a title.