In past, Bhutan had several names, e.g., Lho Jong, ‘The Valleys of the South’, Lho Mon Kha Shi, ‘The Southern Mon Country of Four Approaches’, Lho Jong Men Jong, ‘The Southern Valleys of Medicinal Herbs and Lho Mon Tsenden Jong, ‘The Southern Mon Valleys where Sandlewood Grows’.
For more, check the website https://www.bhutan.travel/page/history-myths.