Mount Darwin was given its name during the voyage of the Beagle by HMS Beagle's captain Robert FitzRoy to celebrate Charles Darwin's 25th birthday on 12 February 1834. A year earlier FitzRoy had named an expanse of water to the southwest of the mountain the Darwin Sound to commemorate Darwin's quick wit and courage in saving them from being marooned when waves from a mass of ice splitting off a glacier threatened their boats.