Cognomen Ringku (Ringku 
) , in all the world, is quite a rare surname. The surname Ringku is habitual in Southern Asia, particularly Bangladesh, where it is a rare surname, and India, where it is an extremely rare surname. More frequently, Ringku is the forename as well as the last name.
De, Nandi, Mandal, Sarkar, Sharma, Shudra, Chakma, Barman, Biswas, Malakar, Bhowmik, Debnath, Majumder, Aacharyy, Karmakar, Rudrapal, Debbarma, Shukladas, Sutradhar, Chaudhuri, Sarkar Das, Shuklabaidy, Ghosh, Chakraborty, Gogoi, Rabha, Sen, Ali, Pal, Ray, Roy, Deb, Das, Gop, Saha, Shil, Bady, Khan, Debi, Deka, Dhar, Nath, Nama, Marak, Singh, Banik, Begam, Datta, and Bhattacharjee