My comment here is strictly about Atlantis and Atlantis mountains so I dont want it to be misconstrued as a comment on ancient advanced/lost civs in general, a premise I dont really disagree with
The name "Atlas" predates the name "Atlantis". In fact, the words "Atlantic" (as in the ocean) and "Atlantis" are both derived from the root word "Atlas". In Plato's work, he doesnt call it just "Atlantis", he calls it "Atlantis Nesos" which translates as "Island of Atlas", which in English translation got shortened to "Atlantis".
The Atlas mountains were named after the titan Atlas from Greek mythology who was supposedly holding up the heavens (or the world depending on the story) at the westernmost edge of the known world, which at the time was the Gibraltar straits, roughly the Western edge of the Atlas Mountains.
This brings up 2 interesting points.
1. This map that
Chukzombi
talks about that has "Atlantis mountains" I'm extremely skeptical of and I'd like to see a picture of it, since
Chukzombi
claims it exists. I think its bunk.
2. The name Atlantis is recent, relative to when Plato wrote about it and when Greek mythology was formed (1000 BC - 500 BC) vs. when Atlantis supposedly existed (9000 BC). This makes it almost certain that they didn't call themselves Atlanteans or Atlantis and that the whole premise of Atlantis is likely manufactured by Plato who uses Atlas mountains to name this mythical advanced Western civilization.
So I'd like to see an ancient map that has Atlantis mountains if there is one