 In 1817, at a cost of £20,000, he purchased 'Bhein Ghael', a comparatively small but beautifully located Scottish estate on the Isle of Mull, overlooking Ghael Bay.In 1808, David Thompson had given what is now called the Kootenay River the name McGillivray's River, in honour of William and his brother Duncan.After losing the NWC to the HBC, McGillivray had made ready to leave Montreal for a new life in England.