My only question is: Tristan is usual in English (and most other languages that I can find). There are also Tristam, Tristin, etc., but other spellings are much less common.
The real reason behind the naming is that it starts with 'Tri-' (for Trinity) and I'm not really good at giving names to things. :-)
I didn't know Tristan, Tristam etc. were actually existing names, so I took some name ending in -ian (I don't remember which one though) and replaced the beginning with Tri-.
This is something new, sets TDE apart, and for us to move forward, it is good to have a new image.
I'm glad that someone actually remembered this old proposed mascot and that there seems to be renewed interest in selecting a new mascot, but the only sure thing is that Tristian is more of a concept which would need to be refined than a ready proposal (and that today I might have done some things differently :-).
-- Philippe