Missed the 'five largest' in the instructions, spent far too long trying islands like Wight, Anglesey, Man, and Arran, and Islay before Skye was accepted.
Sounds like a you problem... it may not be the most common name but it does appear to be a possible and valid name. In French it's Archipel d'Hochelaga, and it takes its name from a Native American group previously inhabiting the area
Hochelaga is correct. If you know obscure Canadian history, then the answer is easy. The name came about the same time the French mistaken the word for village (Kanata, now Canada) to be the name of the whole region.
The etymology is correct, but the fact that it was a mistake is itself a misunderstanding, from what I can find from a quick search. (There are many etymologies claimed to be foreign words applied in error, but that just implies that explorers and colonisers were bumbling fools who didn't know what they were doing, when actually their interactions with native peoples were fully conscious and fitted perfectly into their horrific plans of colonialism.)
I do not see why. Accepting Grand or Grande is meaningful to me because of the close pronunciation, but Gran is not used at all to describe this island.
Carbrera is the fifth biggest balearic island.
Hochelaga islands are inaccurate past montreal and jesus and I'm fairly sure there are some other small islands in the mascerene islands as well.
Still fun quiz :)
Albemarle/Albermarle, Indefatigable, Narborough, James, Chatham.
I didn't check the quiz for this but I think San Salvador should also be accepted for Santiago.