The adventure of the Greyhawk PCs trapped on the Warden was described in "Faceless Men and Clockwork Monsters" in Dragon #17. That article said "The names given for the characters have been changed in order to protect the innocent..." indicating that we don't actually know what their "real" names were, but the list the article gives is:
Scrag Flatchet, 9th level human assassin.
Thurible of Roaky, 9th level human cleric (played by Gary Gygax).
Dorag, 9th level human fighter (played by Luke Gygax).
Nivell, 8th level human fighter
Neb Rentar. 8th level human magic user (played by Brian Blume, filling in for Mark Ratner).
Hodkin Ap-Awrd, 6th level fighter/5th level half-elven magic-user (played by Ernie Gygax).
3 NPC gnolls.
Jim Ward DMed (ShipMastered, technically, since this was Metamorphosis Alpha) this part of the adventure, but the previous installment, in which the characters were sent to the Warden via a cursed scroll, was DMed by Gary Gygax.
Presumably Wren the Elven Prince was "Hodkin Ap-Awrd," since that's the only character on the list with elven blood. Ernie Gygax also played Melf, who was an elven prince.
According to the article, the only characters who escaped were Neb Rentar and one of the gnolls, with the others remaining trapped on the ship. The only one of these characters to appear in other Greyhawk sources was Neb Rentar, who was mentioned (as Neb Retnar) in Iuz the Evil as part of the adventuring party who freed Iuz, and who subsequently went insane.