VayidomAharon:
Those heretics stole that name – Tzion – from our Torah.
The gentiles happen to also know of that word from their “Bible”.
None of that disqualifies a Jew from using that word. Tzion is part of G-d’s holy language, meaning that it is for Jews.
The implication of your post, though, is backwards. The Nazis got at least some of their propaganda from the early Zionists. For example, look up the origins of “A Jew’s life is a dog’s life” and the offensive and antisemitic and patently false canard “Jews cannot be loyal citizens of their host countries” and much more. That last one is a real doozy, especially from a movement that claims to be all about protecting Jews (regardless of the merit or lack thereof of that assertion).
So, regardless of the merits of your claims against either gentile you mentioned, it’s actually the other way around, as noted.