Cognomen Kulen (Kulen 
) , worldwide, is a rare family name. The last name Kulen is characteristic of Norway, where it is a rare surname, Switzerland, and Sri Lanka. In absolute terms, it is commonest in Turkey, Malaysia, and Sri Lanka. More frequently, Kulen is the forename as well as the last name.
Ray, Baruah, Barman, Biswas, Bhuyan, Kalita, Kakati, Konwar, Pathak, Mahanta, Saharia, Baishya, Daimari, Daimary, Narzary, Adhikari, Bordoloi, Talukdar, Thakuria, Hazarika, Choudhury, Debsharma, Singha, Basumatary, Sharma, Sarkar, Roy, Das, Baro, Boro, Bora, Koch, Deka, Dran, Nath, Okan, Medhi, Sarma, Barua, Patar, Rabha, Dutta, Gogoi, Haloi, Yadav, Mandal, Sarmah, Saikia, and Rajbongshi