Louisa Harriet Mackinnon (1819–1847)
Louisa Harriet Cochrane (1847–1902)

Baptised in South Stonham, Southampton, Hampshire, the daughter of William Alexander Mackinnon of Mackinnon (ODNB) and his wife Emma Mary. Married Thomas Barnes Cochrane, later eleventh earl of Dundonald, in France in 1847. From 1860 Countess of Dundonald.