Maybe they chose that name a disambiguation so as to be only associated with the god Atlas, and not the city Atlantis or its suggested founding leader Atlas (son of Poseidon).
I think they just like making puns. A founder had a blog called "rebelutionary". slide 4 here: https://slideplayer.com/slide/5874486/ http://blogs.atlassian.com/rebelutionary/archives/000834.htm... (dead link)
The actual word for pertaining to Atlas: https://en.m.wikipedia.org/wiki/Atlantean