The Elvhen split and become the many races.

Population Migration / Travel

"It was then that my people split to the many corners of the world and were changed by the deep magics of the land, even the people who stayed in our homes changed. We the Elven are the closest to the first mortals. Too my knowledge only three of the Elvhen remain. Though I imagine time spent in places of power has changed them as well." --- Os'ham Val'heen

The Elvhen race faced a great schism, they split and wandered to the corners of the world. They became all the races of the world, except the Orcs, their origin is of dubious nature.