hehe, I like etymology so I kinda have a guess at what language it is. For werewolf it would be old English roots from words like "wer" meaning man and "wulf" meaning... wolf...
As for Lycan, I believe that's short short Lycanthrope or Lycanthropy and comes from ancient Greek lykanthropos, lykos meaning wolf, and anthropos for human. (checks wiki too) :3