Baldrick: My Uncle Baldrick was in a play once.
Blackadder: Really?
Baldrick: Yeah. It was called Macbeth.
Blackadder: And what did he play?
Baldrick: Second codpiece. Macbeth wore him in the fight scenes.
Blackadder: So, he was a stunt codpiece.
Baldrick: Yeah, that's right.
Blackadder: Did he have a large part?
Baldrick: Depends who was playing Macbeth.
Blackadder: Baldrick, I would like to say how much I will miss your honest, friendly companionship.
Baldrick: Thank you Mr. B.
Blackadder: But, as we both know, it would be an utter lie. I will therefore confine myself to saying simply sod off, and if I ever meet you again, it will be twenty billion years too soon.
Blackadder: I've had it up to here with that Prince. One more insult and our contract will be as broken as this jug
Baldrick: But that jug's not broken
Blackadder: You really do walk right into these things, don't you Baldrick?
[Smashes the jug on Baldrick's head.].
Answer: The closest we ever get to knowing his first name is in series 3, when he claims it's "Sod Off". Blackadder asks him in series 3 where this came from, and he replies "Well, when I was a kid, living in the gutter, I'd go up to the other kids and say 'Hello, I'm Baldrick'. And they'd say, 'Yes, we know. Sod off, Baldrick.'" The S in this series is likely a reference to that, but it's not addressed, and given this Baldrick is clearly different from the series 3 Baldrick, we can't draw a direct link.
Shay