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Rear-AdmiralLordJohnHay (1 April 1788-26 August 1851), the third son of George Hay, 7th Marquess of Tweeddale and a Royal Navy officer.
Admiral of the FleetLordJohnHay (23 August 1827-4 May 1916), the fourth son of George Hay, 8th Marquess of Tweeddale and a Royal Navy officer.
He was Fifth Naval Lord, April-May 1866; Fourth Naval Lord, May-July 1866; Third Naval Lord, 1868-1871; Second Naval Lord, 1880-1883; First Naval Lord, 1886; and Admiral of the Fleet, 1888.