The original spelling of Montague Island was Montagu! The spelling changed to Montague on the 2nd June 1972. There is no explanation in why the spelling of the name changed. Montague Island was named after the second Earl of Halifax George Montagu Dunk,
Montague Island started as a hill than a headland and now a Island!
In the last Ice Age, about 17000 to 20000 years ago, six kilometres inland, Montague Island was a hill. Montague Island become a headland when the climate warned and the ice melted. The sea level rise 10000 years ago to within 30 metres of what it is today and Montague Island.
With the sea still rising this created two large Islands – Montague Island and another Island to the south. 6000 Years ago the coastline was as it is today.
Once it became an Island Aboriginal people made seasonal visit to Montague Island by Canoe. There is two freshwater springs on the Island and access to many food sources, birds, bird eggs, fish, penguins and possible seals.