They are usually opportunists by nature (No, i m not racist and i have nothing against them) like these Eastern Europeans we see around here. During Mahendra's rule, they changed to Gurung so that they can get free visa and go to Hongkong and other countries to do small trade, who later turned out to drug smugglers, the Manange's. Now the ones here in NYC, they are the fake Tibetan refugees ( Ask any one of them. They don't identify themselves as Nepali, they identify themselves as Tibetans as if they are ashamed to call themselves Nepali ). And dont forget Tenjing Sherpa who changed to Indian nationality after he climbed Mt. Everest.