Most of the sentient races have a spoken language, and several of those have a written language as well.  Amazingly (blame magic), the languages of Daera correlate almost perfectly with languages found on Earth. See below:

Daeran Language

Earth Parallel


Spoken By

Abyssal Enochian Infernal Demons, chaotic evil outsiders
Aklo Harappan Indus Naga, reckless spellcasters
Anarchic Romani Draconic Gith, Slaadi, chaotic outsiders
Aquan Hawaiian Elven Water-based creatures
Auran Tamil Draconic Air-based creatures
Celestial Hebrew Celestial Good outsiders
Common (Lexi) American English Common Most people
Draconic Latin Draconic Kobolds, troglodytes, lizardfolk, dragons
Druidic Ogham Druidic Druids (only)
Dwarven Swedish Dwarven Dwarves
Elven Suomi (Finnish) Elven Elves, Posers
Giant Welsh Dwarven Ogres, Giants
Gnomish French Dwarven Gnomes
Goblin (die Sprache) German Dwarven Goblins, hobgoblins, bugbears
Gnoll Egyptian Common Gnolls
Hobbit Spanish Common Hobbits (Halflings)
Ignan Arabic Draconic Fire-based creatures
Infernal Esperanto Infernal Devils, lawful evil outsiders
Mechani Machine Dwarven Modrons, Inevitables, lawful outsiders
Orc Māori Draconic Orcs
Sylvan Gaelic (Irish) Elven Dryads, brownies, leprechauns
Terran !Kung Dwarven Xorns and other earth-based creatures
Undercommon Russian Elven Drow