The river was named in December 1829 by naval ship's surgeon Thomas Braidwood Wilson after his mentor, naval surgeon Alexander Denmark, Physician of the Fleet, Resident Physician at the Royal Hospital Haslar, and past-Physician to the Mediterranean Fleet.
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A surveyor noted in 1833 that the local aborigines, the Noongar, called the river "Koorrabup" that means "Place of the Black Swan".
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