HI Athna May,
I am not sure if you are still on here, but I thought I'd try.
I don't know anything about the Hronis' of which you speak, I don't believe we are related in any way. I have never heard of these names, so I would imagine not.
Not sure about the commonality of the name Hronis in Epirus. Maybe you can somehow access thier census.
Sorry, I can't help much.