I'm guessing an engineer named it the German equivalent of "pre-crash" sound, then someone in marketing decided that "pre-safe" sounds better. It may be better to call it "foreplay" sound, since if you ever hear it you're probably screwed.
So many startups do this too with product names, they fear whatever name will be too "limiting" and end up with some generic name that doesn't communicate anything at all.
Brand names shouldn't be taken so literally either, no one cares that "Vodafone" sells Internet and TV connections, not just cell phones. Or that Salesforce sells a whole bunch of products unrelated to sales. Or Facebook is expanding outside of social networks into AI and VR. But more importantly than the brand/trademark is the product names don't have to be all encompassing of everything the product does (or plans to do in the future).
People are smart enough to connect a name to a group of things even if the name is only about one of them. And a negative term like 'pre crash' is far more memorable than 'pre safe'.
I've seen it most often in rocketry contexts - you "safe the rocket" in an aborted launch scenario so it won't go off accidentally, etc.
"It is a good idea to add a safety release valve to your launcher. Sometimes it is important to abort a launch and safe the rocket after it has been pressurised." http://www.aircommandrockets.com/rocket_launcher.htm (Google "safe the rocket" for occasional other examples.)
It's safing in advance of the event (pre-safe), rather than after the event (post-safe), which would be too late.