There is no official/canon translation, but some suggestions and words to consider if you want to get creative:

• see = Koraav (canon)
• watcher = Koraaviik (or, arguably, Koraavaan)
• champion/defender = Kaal (canon)
• champion of the people (humans) = Kaalsejul
• champion of the mortal(s) = Kaalsejoor(re)
• watcher of the people = Koraaviiksejul / Koraaviiksejoorre
• watcher for the people = Koraav fah jul / joorre

I was thinking "Zorro" when I thought of how to break down the word and define it using dragon words.