"A rose by any other name would smell as sweet" could easily be replaced by "A black gripped luger by any other name would look as badass". I guess it all comes down to just how anal retentive one happens to be.
http://en.wikipedia.org/wiki/Anal_retentiveness
Personally, I don't care either way. I'll call it whatever you'd like. I'll go out on a limb and say that many who dislike the term "Black Widow" have no problem referring to the "United States Rifle, Caliber .30, M1" as a "Garand". It's not quite the same, but it's not much different.
Jack
By the way, nice luger!