Re-rigging a model

I’ve currently got a couple of models that are rigged, but only for ragdolling. They do not have the right bone names/bones for player/npc models.

Is there a tutorial on how to re-rig them?

That’s how to do it in XSI modtools. Depending on your modelling program things might be slightly different but I know milkshape also has premade Valve rigs in it that will let you follow this method more or less.
I recommend watching his videos.