Since we are discovering how differently these names can sound in different languages, there is a funny one in Portuguese too. :-)

"Tristan" is traditionally "Tristão" in Portuguese (as in Tristão e Isolda).

The problem — or perhaps just the amusing coincidence — is that to a modern Portuguese speaker, "Tristão" sounds very close to "triste" ("sad") plus the common augmentative ending "-ão". So it can jokingly sound like something along the lines of "very sad" or "big sad one".

So far we have Tristian sounding a little like "Christian" in English, Trina apparently not working very well in German, and Tristan becoming a rather sad bear in Portuguese. :-)

I suppose naming an international mascot is harder than it looks.

Cheers, Sebastião