It is most often called Common, though it is derived mostly from Lemur/Kran.
Technically, no other language is commonly used, as they have not been passed down through the generations. Any language other than Common/Lemur/Kran that you are using has been rediscovered over the last two generations (through books found/released/whatever) so there is NO character completely fluent in the other race tongues, and much of their language has been lost forever. As such, NO character would be raised completely under the influence of another language. Aka, the "I grew up in a village of [Race] that only spoke [Language] so I am different than you" story. No such village exists.