I think you're right about the use of Viking being early, but some of the other elements differ from my understanding.
Two awesome sidebars from that period - another Germanic tribe, the Vandals, wrought havoc moving through what would become France and Spain. And a tribe of Scots were forced from their ancestral home ... in modern day Ireland. They replaced the earlier Picts in the land ultimately named after them.
[Edit: Corrected the Sacking of Rome date - I was out by 2 weeks. So worth clarifying that this is from my memory of university history courses, not a fact-checked review.]