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Metal Guru: Engelska wikipedia ger även här en del info:

"The name Britain is derived from the name Britannia, used by the Romans from circa 55 BC and increasingly used to describe the island which had formerly been known as insula Albionum, the "island of the Albions".[8] Albion (Alouion in Ptolemy) is sometimes used now to refer to England specifically. Occasionally, it refers to Scotland, which is called Alba in Gaelic, Albain in Irish, and Yr Alban in Welsh. Pliny the Elder in his Natural History (iv.xvi.102) applies it unequivocally to Great Britain.

The name Britannia derived from the travel writings of the ancient Greek Pytheas around 320 BC, which described various islands in the North Atlantic as far North as Thule (probably Iceland) [9]. Although Pytheas' own writings do not survive, later Greek writers described the islands as the αι Βρεττανιαι or the Brittanic Isles.[8][10] The peoples of these islands of Prettanike were called the Πρεττανοι, Priteni or Pretani.[8] These names derived from a Celtic name which is likely to have reached Pytheas from the Gauls, who may have used it as their term for the inhabitants of the islands.[10][11] Priteni is the source of the Welsh language term Prydain, Britain, which has the same source as the Goidelic term Cruithne used to refer to the early Brythonic speaking inhabitants of Ireland and the north of Scotland.[10] The latter were later called Picts or Caledonians by the Romans."