What do you think the Forerunners’ real species name is?
Protheans
They are self-titled the Forerunners. I’m not sure if they had some kind of system like we do for naming species, but I’m sure whatever they did have worked much much better xD
The Caveat.
True story.
I really hope we find out one day, If it ends up being “nephilim” Then my mind will melt.
Ghibalbanian
Forerunners.
Gallifreyans. 
They named themselves the Forerunners because they believed that they would one day be passed over for the Mantle. Something about their religion/beliefs if I’m not mistaken…
they are called…
the Masterchiefians
But really, we need to translate the forerunner language. then find out what their word is for “forerunner” and we can call them that