Apparently the capital of Atlantis was Atlantis. The earliest known discussion of Atlantis is in Plato's writings, essentially for the purpose of contrasting it with the city-state of Athens.
However, since Plato's works are in the Public Domain by now, if you want to write your own story about Atlantis and call its capital city Georgis, no one can stop you.
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No God lived on Atlantis. Atlantis was ruled by twelve kings who all died when the island sank. After that nobody lived on or even in Atlantis.
You can not get to Atlantis. It is underwater because of the eruption of Thera.
Atlantis is a myth. The people are myths.
Plato referred to the "kings" of Atlantis.
The people of Atlantis were called Atlantians!