If right now we found a weird island with a population identical to that "common ancestor that goes way further back", the general population would label that a

If right now we found a weird island with a population identical to that "common ancestor that goes way further back", the general population would label that ancestor as an ape - while it's not the same as any of the modern species of great apes, they were morphologically similar to primates as such, not something totally alien or conceptually different.