I think the term Huns in this case is just a reference to the nomadic peoples that began to arrive in Eastern Euorpe in the 4th Century. So yes, Atillia it is!
The Huns made thier way across Europe and held a rather large area under numerous warlords. They united into one large empire for a while under the famous leader Atilla, around 450 or so if I remember right.
They would work well in a Roman range representing the end of the Roman Empire. They fought a lot against the Eastern Roman Empire, but also against the Western Empire. Huns were also used as mercenairies by the late period Romans. They would make some impressive figures as they did have a lot of mounted archers.
The slang term 'Hun' as we think of it today came from a speech given before WW1 by Emperor Wilhelm of Germany. He was speaking at a send off for a German corp heading to China to help supress the Boxer Rebellion. Wilhelm basically told the corp to fight with the savagery of the Huns who had been in the area of modern Germany a thousand years earlier. The world press picked up on this and the term Hun took on the savage and barbaric connotation that we understand today.
Noah