Not using a name based in Greek or Roman mythology was supposed to be clever?
Actually, the name Expo67 is in reference to the 1967 World's Fair and Exhibition that was based in Montreal, Canada. A site that was used in the filming of the original Battlestar Galactica episodes 'Greetings From Earth' and 'Experiment In Terra'(it's footage recycled from that previous two-parter).
In 1979, that same recycled footage would be used in depicting the city of New Chicago in Buck Rogers - In The 25th Century. That same year, it would be used as another filming site for the Robert Altman film 'Quintet' and as a setting for Bill Shatner's Star Trek
In Shatner's novel, the Expo 67 site was meticulously reconstructed by the Montreal Historical Society.
Judging by the look of those structures, they could have also been used in the production of Star Trek-The Motion Picture.