Newari language and food is so similar to chinese, koren, japanese; also their looks are similar. I would guess that their origin is from North-China/Tibet. But I am sure someone here who has done formal education on the topic would be able to teach us. I find it very interesting that Newars of Kathmandu are so different from Newars from outside the valley. Growing up, I used to love going to Newari friends wedding parties. Hot chicks, good food and very good chang or tharra :)