Neupane (Nepali: न्यौपाने) is a predominantly Brahmin (Bahun) as well as Chhetri surname of Nepal. All Neupane share the same gotra, Kaundinya, which means all of them share the same forefather, so a Neupane can't marry another Neupane.
Source: wikipedia as of 02/15/2015
http://en.wikipedia.org/wiki/Neupane