Well, there were the two regions as noted (the Formidine Rift was game lore first, not a name the GMP came up with), and the name Colonia. Perhaps there were also some tourist beacons, but I have no idea.
A counter-example where FD went with a different name than what was on the GMP already was Metztli, and perhaps there were other GMP-named systems in the area? I'm not sure.
Still, the post was about regions, so yeah. Personally, I wouldn't expect FD to officially go with "Wagar's Reach" though (what with naming things after living persons), but they still might decide to do so. Most of them should otherwise be fine though - oh, and of course the names of the galactic arms come from real life.