From May 20 through June 3rd, there is to be no discussion of US politics. All existing threads on the subject will be closed. People can start new ones once the hiatus is over. See the thread in Trouble Tickets for more info.
Serious answer - Fort Xagyg, or something similar.
Alternately, I would be tempted to treat "Skullport" as an explicit dark mirror of Greyhawk City; "Kwahyerg" would be the Gygaxian inversion, but it sounds weird and is therefore perfectly Gygaxian. I'm not sure what the thematic opposite of a grey hawk would be - Brightrabbit? Chromamole?