Well, "Herzstopfen" sounds a bit strange in German. Did you mean "Heart Plug" or "Heart Stop"? The German word means "Heart Plug"... or even "Heart Repair"...
I'm not sure if I should post some authentic sounding names, because this is sensitive matter for a german. A lot of stuff I can think of would be very bad taste... for a German it's very uncomfortable to use nazi-vocabulary in a game. Or at all...
You can use a combination of "Wolf" (well, yeah, means wolf) or Adler (eagle), "Schaedel" (ae = umlaut a, means Skull), "Kraft" (strength) "Blitz" (Lightning) and "Blut" (Blood). Something like this sounds vaguely third reich, but it does not have a direct reference. Of course, some combinations don't work.
So names could be:
A nazi villain-group could be called "Wolfsrudel" (pack of wolves)...
If someone needs a name for a german character, villain oder hero, feel free to PM me
I'll be glad to help.