Latin names cannot and did not end in -en.
Angel would be angelus in Latin and angelos in Greek. Greece in Latin would be Graecia and in Greek Hellas. So I think you are the victim of somebody's overactive imagination.
I've also noticed that a lot of people at the overactive end of the
Christian spectrum get their kicks out of naming angels, demons and other such, er, beings. Perhaps this is an example of that kind of fantasy?
Who is the patron saint of Greece - is it St
George? That might be a more respectable way to go.