Blackadder: Percy, you are dismissed from my services.
Percy: Me? Why?
Blackadder: Because Percy, far from being a fit consort for a prince of the realm, you would bore the leggings off a village idiot. You ride a horse rather less well than another horse would. Your brain would make a grain of sand look large and ungainly. And the part of you that can't be mentioned, I am reliably informed by women around the court, wouldn't be worth mentioning even if it could be. If you put on a floppy hat and a furry cod-piece, you might just get by as a fool, but since you wouldn't know a joke if it got up and gave you a haircut, I doubt it. THAT is why you are dismissed.
Edmund: He murdered his whole family!
Pete: Who didn't? I certainly killed mine.
Wilfred: And I killed mine.
Friar: And I killed yours.
Sean: Did you?
Friar: Yes.
Sean: Good on you, Father.
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