In the early setting books and articles about the Golarion setting and its Great Beyond, such as the Inner Sea World Guide or The Great Beyond, one of the outer planes was called The Boneyeard, where Pharasma resides. Just now, I'm finding apparent references to it under a new name: Purgatory.
It seems listed as such in the Gamemastery Guide, under Planar Adventures, Outer Planes.
Another hint towards this is in Bestiary 2 where the "dead" Petitioners are from Purgatory, a True Neutral plane... with The Boneyeard nowhere to be found.
Similarly, The Maelstrom seems replaced by Limbo (more in line with the Planescape setting) and Axis seems to have become Utopia.
Are these synonyms? New replacing names? Or is The Boneyard within Purgatory? The other way around?