I see my last name, "Teillon" in Finnish newsgroups posts.  I want to
know exactly what "teillon" means in Finnish?

The answer is incorrect. 'Teillon' is a combination of two words
'Teillä' (you, plural) and 'on' (have). It's commonly used in speech,
but never in formal writing.

The InterTran translation service is a horrible one, at least when it
comes to translating finnish. I have no clue how 'teillon' translates
to 'destroy' - it's 'tuhota' in finnish.

Tenori--

Thanks for this clarification.  I thought theta's answer was strange. 
I had spent hours before trying to use online translators, never to
any success.  I also had some notion that "teillon" was some kind of
pronoun by the way it is used in the newsgroups.

Finnish is a hard language to translate! :)

Thanks again,

Teillon