What race has Sorcerers' Tongue as their native tongue?

[David Bofinger]

Three hundred years after Jen Mnoren’s first jump, his descendants had found, mapped, and conquered three hundred seventy-one alternate Earths. Three had space travel; eleven had magic.

Sorcerer's Tongue was probably the native language of an important culture on one of those eleven worlds, the one from which the Mnoren learnt magic. It might be the first of the eleven which the Mnoren found, it might be the most advanced of them.

Common probably evolved from a creole of the Mnoren native language. Or it might have been made from whole cloth by the Mnoren like Esperanto.

Of course it's been a long time. All the languages will have changed.