Below is a short introduction to the languages spoken on myaasia:
There are 5 native base tongues, these are really not spoken by anyone, but some scholars can read the and even fewer people talk.
Most(about 95%) of the actual tongues are some derivate of those 5 (Think of Latin as the base tongue and French, Spanish, Italian, Portugese etc. as the actual active languages)
The relationships for some common tongues:
All these have many dialects, and some of the dialects are far enough that two speakers of the supposedly same language could have difficulty of understanding each other.
Each of the 12 dragonlords that used to be had a own tongue that the dragons spoke, usually in the forms of a “high tongue” “normal tongue” and “low tongue” and many others.
other geographical places will ofcourse have other tongues
Other planes have their own languages ofcourse, but again most such places seem to have a “common” thus most firecreatures know atleast a bit of “fire common” and so on..
Most people would know their own langauge, maybe some neighbouring language and common.
Most wizards would also learn written Ivak and Iylar at some point.
Most elemental bloods would know the local langauge and the correct elemental tongue