I need to split a couple hairs on this.
I believe the original toggle top pistol is properly called a Borchardt.
Luger named his redesign of the Borchardt the "Parabellum".
Luger is the common name used in the US, and I suppose it might be called an anachronism.
Stoeger still owns the rights to the trade name "Luger". I have a couple of their .22s, and a stainless steel P.08 with Stoeger and Luger marked on it.
I would not call the 1970s Mauser Swiss pattern "Lugers" a clone. Reintroduced limited production would probably be the most accurate as it was one of the original manufacturers, and I understand they used at least some of the original tooling, which they got back from the Swiss, to make them. A small matter, really.
7,65mm Parabellum, 9mm Parabellum are correct, and proper, but you know how sloppy we are in casual conversation (and sometimes not so casual), so its "Luger" in the US, for better or worse. That is changing for the 9mm, its less and less the 9mm Luger and more and more the 9mm Para(bellum), 9x19, or 9mm NATO.
Still only seeing .30 Luger on US made ammo though that may change eventually, too....
You are right, the proper name is the Parabellum, unless, its a P.08, in which case that would also be correct.
If you talk to folks (in the US) who are not already some degree of enthusiast, and say Parabellum or P.08 they often get confused, but if you say Luger, they have at least an idea what you are talking about.
So, how bad is it when somebody says "I want a clip to fit my Luger"?