He was the son of Admiral of the Fleet Sir Thomas John Cochrane, son of Admiral the Honourable Sir Alexander Cochrane, sixth son of Thomas Cochrane, 8th Earl of Dundonald (see the Earl of Dundonald for earlier history of the Cochrane family).
Lord Dundonald died at his home in Wimbledon in April 1935, aged 82, and was succeeded in the earldom by his eldest son, Thomas.
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Cochrane was the second but eldest surviving son of Thomas Cochrane, 11th Earl of Dundonald, by Louisa Harriet Mackinnon, daughter of William Alexander Mackinnon.
Earl of Dundonald has a subsidiary of Baron Cochrane of Paisley and Ochiltree
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William Cochrane, 1st Earl of Dundonald who prior to receiving the earldom was create Baron Cochrane of Dundonald
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: This article discusses a village in Scotland, for the town in Northern Ireland, see Dundonald; For the Scottish peerage, see Earl of Dundonald.
Several other less extensive, but important collections were commissioned by William Burnley, the Scottish-American planter, John Lamont and the Earl of Dundonald.
He was the son and heir of George Ross, 11th Lord Ross, who died in 1682, by Grizel, daughter of William Cochrane, 1st Earl of Dundonald.