Sad day for RoadStar Island, it got the Zolo treatment and became LoadStar island. Poor island
Lodestar is an actual word in the dictionary. It's a star used as a navigational reference like the North Star.
It could reference the fact that all pirate navigators eventually end up on this island, at least following the Log Pose. Or it could serve as guiding star that sets pirates on a new path by telling them about the poneglyphs and hinting at a final island.