Answer:
Matthew Flinders became famous through his exploration work.
He first circumnavigated Van Diemen's Land (now Tasmania) with George Bass, determining that Tasmania was an island, and thereby reducing travel time from South Africa to New South wales by a full week.
Between December 1801 and June 1803, Flinders charted the entire coastline of Australia, filling in the gaps in the knowledge of Australia's coast.
Australia was previously known as New Holland, and Flinders first proposed the name "Terra Australis", which became "Australia", the name adopted in 1824. He also wrote a book, A Voyage to Terra Australis.