I done a quick google and found original German movie posters and movie soundtracks titled "Der Blade Runner" so I have added it to the main German translated title of the film.

Am I 100 percent sure that this is the main title and not just an alternative title... No I'm not, if anyone can say otherwise please do.

It is not widley known I guess, as most people nowaday just know the Directors cut. But iirc first theatrical release and first VHS Videos, before directors cut came, all named it as Der Blade Runner.