Greekland

Once on a time fared he in a ship to Greekland, for that there was a king's daughter on whom he had set his mind, […]

Source: wiktionary

Scores of the old rune-stones speak of the Warings and Captains and Shipmen (and perhaps, now and then, Merchants or Pilgrims going to or from the Holy Land) who served "in Greece", "in Greekland", who "gained wealth in Greece", who "died in Greekland", who were mere "Greek farers", visited "Greek Havens" &c. in the 10th, 11th, 12th centuries.

Source: wiktionary

They speak about men who perished on Viking expeditions to faraway countries — westward to England, most especially eastward to Gardarike (the present Russia), to Greekland (the lands comprising the Byzantine Empire), to Sarkland (the Mohammedan countries about the Black Sea), to Jorsalaland (Jerusalem), to Langbardaland (the present Italy).

Source: wiktionary

Nowhere do we find that 'Epirus' means Greekland. If 'Epirus' could thus most conveniently be stretched to mean Greekland, then the world would forever be faced with a chaotic situation.

Source: wiktionary