Cognomen Birash (Birash 
) , all over the world, is an extremely rare last name. The family name Birash is characteristic of Southern Asia, particularly India, where it is an extremely rare surname. Predominantly, Birash is the forename as well as the last name.
Bai, Kumar, Kujur, Patra, Rabha, Lohar, Toppo, Oraon, Sangma, Chakma, Barman, Badaik, Brahma, Kharel, Kumari, Gautam, Juanga, Tamang, Hajong, Khariya, Daimari, Narzary, Singh, Munda, Minja, Marak, Pun, Ray, Rai, Roy, Das, Mani, Sahu, Anal, Baro, Boro, Muchahary, Bhan, Koch, Pati, Pudi, Devi, Lama, Nath, Naik, Oram, Urao, Udao, Bhoi, and Basumatary