What is the origin of Faerun’s languages?

I’m not a D&D pro but I’m writing a thesis about how Tolkien created his languages and which was/is their following influence.

A friend of mine told me that the languages of Faerun are inspired by Tolkien, isn’t it?

I would like to find something technical about the origins of Faerun languages.

Have you got any suggestions? What is the origin of Faerun’s languages?

[Just to be clear: how inventors developed the languages, on which basis]