The river is named after William Locke Brockman who was a pastoralist in the region with large land holdings and a Member of the Western Australian Legislative Council.
William Locke Brockman (1802–1872), settler and politician in Western Australia
He named his grant Herne Hill, and this name survives today as the name of the Perth suburb of Herne Hill.
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In the informal election of May 1867, he was elected for Guildford, and was accordingly nominated to the council.
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