Guspaz said:

Quebecer here, you never see it referred to as anything except "La guerre des étoiles". It's definitely not just for the 70mm or 1977 release, its the normal name of the whole franchise. But then you will see "Star Trek"...

Hmmm, interesting! I'm in France and both Star Wars and La Guerre des Etoiles are definitely used. However, I don't really have any French friends who are big fans of the movies, nor hang out at any French Star Wars forums, so my hypothesis was purely conjuncture in nature.

Star Trek on the other hand is REALLY obscure in France. Most people here might have heard of the name Spock, but before the 2009 reboot, it only had a really tiny following.