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The earliest known references to the islands as a group appeared in the writings of sea-farers from the ancient Greek colony of Massalia. The original records have been lost; however, later writings, e.g. Avienus's Ora maritima, that quoted from the Massaliote Periplus (6th century BC) and from Pytheas's On the Ocean (circa 325320 BC) have survived. In the 1st century BC, Diodorus Siculus has Prettanike nesos, "the British Island", and Prettanoi, "the Britons". Strabo used (Brettanike), and Marcian of Heraclea, in his Periplus maris exteri, used (the Prettanic Isles) to refer to the islands. Historians today, though not in absolute agreement, largely agree that these Greek and Latin names were probably drawn from native Celtic-language names for the archipelago. Along these lines, the inhabitants of the islands were called the (Priteni or Pretani). The shift from the "P" of Pretannia to the "B" of Britannia by the Romans occurred during the time of Julius Caesar.

Most historians today agree that these British names most likely originated from what native languages names?
unanswerable