Cognomen Lachit (Lachit 
) , worldwide, is a rare last name. The cognomen Lachit is habitual in Myanmar, where it is a rare surname, Thailand, where it is a very rare surname, and India. More frequently, Lachit is the forename as well as the last name.
Ali, Boruah, Brahma, Bhuyan, Kalita, Konwar, Pathak, Phukan, Phukon, Hajong, Sonowal, Baishya, Kachari, Daimary, Narzary, Talukdar, Thakuria, Hazarika, Muchahary, Sutradhar, Chaianong, Choudhury, Barman, Baruah, Chutia, Chetia, Ray, Roy, Das, Baro, Boro, Bora, Koch, Pegu, Deka, Nath, Ramchiary, Marak, Sarma, Borah, Patel, Rabha, Doley, Dutta, Gogoi, Haloi, Sangma, Saikia, Medhi, and Basumatary