William Kerr, 5th Marquess of Lothian
General William John Kerr, 5th Marquess of Lothian was a British soldier and peer, styled Lord Newbottle until 1767 and Earl of Ancram from 1767 to 1775.
He was the son of William Kerr, 4th Marquess of Lothian and succeeded to the title in 1775.
, William Kerr's wife.
He married Elizabeth Fortescue, daughter of Chichester Fortescue of Dromisken, Co. Louth and Elizabeth, on 15 July 1762. They had nine children:
- William Kerr, 6th Marquess of Lothian
- Lady Elizabeth Kerr, married John Dormer, 10th Baron Dormer, without issue
- Lady Caroline Sidney Kerr
- Lady Mary Kerr, married Gen. Hon. Frederick St John and had issue
- Lady Louisa Kerr, who married Arthur Atherley on 2 June 1793 and had issue
- Lady Harriet Kerr
- Lord Charles Beauchamp Kerr, married Elizabeth Crump and had issue
- Vice-Admiral Lord Mark Robert Kerr, married Charlotte Macdonnell, suo jure Countess of Antrim, and had issue
- Maj.-Gen. Lord Robert Kerr, married Mary Gilbert and had issue
