I only realized today, after re-watching the last 3rd of the film The Golden Compass on HBO that the name "Lyra" was an... "aural anagram" for "liar". It was so obvious. She was the liar who (with the compass) can see the truth in everything.
The thing that really bothered me about that movie was that the protagonist was an expert liar. It was sort of a coincidence also that earlier this week I read about the movie in a blog (or was it a forum?) saying that the trouble with the movie was that Lyra had no respect for authority. I didn't really notice, nor did it bother me much when I learned about it. And although respect for authority is important, questioning the motives of leaders is also important. However, true learning can only be gained by giving due regard to someone (or something) other than oneself.
Now, I'm not absolutely honest with everything and everyone, but I am not "a liar", and definitely a bad one :'p
"Speak the truth always, even if it leads to your death." ~Godfrey of Ibelin, Kingdom of Heaven
Some links (with some interesting facts) on the name "Lyra":
Lyra on Answers.com: http://www.answers.com/topic/lyra
Lyra on PokeMyName.com: http://www.pokemyname.com/firstname_27331_lyra.htm