Actually I reside in Denver, too! I have
managed to trace the Danos name back directly
to France. I was fortunate enough to be able
to speak to a great uncle who was on his death
bed regarding his father and mother's name.
It was the missing link for my family tree. So,
as far as I know the Danos name
(at least in my family) is not Greek. However,
since I read that it was also spelled 'Danot'
at times, I suppose that Danopolis could have
very well been shortened to Danos. So, it's quite possible
to be part of the French Danos family or the Greek one.
In fact, what I learned most from my gen-research was that
nearly anything is possible. Good luck.