The Elite
BOSS
when Ren abducts Rey outside Maz' palace
That makes complete sense.
So are he star systems just named after their habitable worlds? Or is Luke saying Yoda is in the Dagobah system just just an oddity line from OT?
Maybe they name the systems and then if there is a habitable planet it just ends up going by that name. If they named our system the Sol System and we were Sol III they would just refer to the habitable planet as Sol.