i don't think this was mentioned anywhere else in this thread, but sorry if it was: Darkstar was a Marvel comic book character who was a member of the Champions and the Soviet Super-Soldiers (among other teams). She was never a high-profile character, but a fairly popular one for a time. We know that GRRM is a comic fan so it's possible for Gerold Dayne the Darkstar to be an allusion to the comic character. (Not likely, but I thought I'd mention it.) Also, DC Comics featured a short-lived comic called Darkstars in the early '90s.
