Regions in your homeworld?

[Hjorimir]

I have tons of regional languages. I like language barriers as they help make the world seem large and complex while helping the players identify cultural lines. A quick list:

Ainurian, Castulian, Eduni, Fjoti, Gine (giant), Idrû (goblin), Kishtü, Kodaijin, Maqess, Relthuk (dwarven), Rumaeic, Saar’vul (draconic), Tefratii, Tûl (orcish), Vé (elven), and Vuusti.

Also, Iyah, the language of celestial creatures, be them of the heavens or of the pits. (This makes more sense on a cosmological level for my setting). Also, it should probably be noted that Saar'vul is amongst the most common tongue upon the Essentialities (The Inner Planes).

When a monster is indicated as speaking common, it is the language common to that particular region.

 

[Evilhalfling]

I have 5 common human languages, one of which is actually halfling. Elves, halflings and dwarves all evolved on seperate continents. And while there has been some emegration all three races are regionally concentrated. There isn't a widespread common tounge spoken on more than one contanent. The racial languages have driffted apart some, but are still understandable to members from other areas.

This is greatly simplified from how many different languages there were in the real world.

The language of magic also comes in two distinict kinds, one based on elvish the other on draconic.

 

[kigmatzomat]

I run DL so there are four "common" tongues, Solamnic (Ansalon), Uigan (Taladas-Tamire), Auric (Taladas-east/west) , Thanoi (the arctic regions). These areas are large enough for a common tongue to be useful and encouraged, especially by the church hierarchies and merchants, but not so large that it would be infeasible to minimize linguistic drift.

It makes life interesting when half the players suddenly realize they have no ability to converse. The monk has become quite fond of his "speak all languages" ability and the gnome's helm of comprehend languages is quite coveted.