kuatan is the race of which Goro, Kintaro, and Sheeva are.

No, the race that they all are is Shokan. Kuatan is the name of the palace that's in MK:DA and MK:D. Not sure if it's named after anyone though.

Kuatan is the palace where Goro lived because he was a prince and in Kitana's ending form MK:DA, it shows how Goro's body was lowered into the lava in HIS throne room, which is the playable stage in MK:D. If you look, you'll see a throne in the background in this stage.

Kuatan is the kingdom of the Shokan. If you have ever seen Lord Of The Rings, Gondor is the kingdom where all the humans live. In Mortal Kombat, Kuatan is where all the Shokan live.

I just smacked myself in the forhead so hard I think i'm gonna suffer brain damage...

thanks :)