Yep, I understand the logic. vtk* ==> typically inherits vtkObject/vtkObjectBase, QVTK ==> inherits QObject. I believe it’s discouraged to use the Q* prefix for classes outside of Qt itself though (even if the VTK probably makes this OK).
In my suggestion vtkQWidget, I thought that even if it’s not inheriting vtkObject, it is a VTK class, so has the vtk* prefix, and it’s a QWidget, hence the QWidget in the name (the Q included to not be confused with VTK’s own widgets), and the OpenGL has been left out since it’s an implementation detail.
But the more I think of it, it’s probably water under the bridge, with the QVTK* prefix used for a bunch of classes in VTK at this point. So let’s keep it that way!