The Bhutia are ethnic Tibetans who speak Sikkimese, a Tibetan dialect fairly mutually intelligible to standard Tibetan. In 2001, the Bhutia numbered around 70,300. Bhutia here refers to Sikkimese Tibetans; in contrast, the Bhotiya are a larger family of related Tibetan peoples in northern Nepal of which the Bhutia are one member group.
Source: ebay