Let's see how many we can count...
  1. Common (ie: English for want of a better term)
  2. Amaljaa
  3. Ixal
  4. Sylph
  5. Kobold
  6. Sahagin
  7. Goblin
  8. Mooglespeak
  9. Draconian
And other possible contenders, if we make certain echo-related arguments...
  1. Ancient Roegadyn
  2. Ququirin
  3. Goblin
  4. Garlean
  5. Aethyrial (Elementals)

So I currently count up to 14.