Cognomen Gainu (Gainu 
) , across the world, is a very rare surname. The last name Gainu is characteristic of Nigeria, where it is a very rare surname, and India, where it is an extremely rare surname. Much more prevalently, Gainu is the forename as well as the last name.
Sah, Yadav, Mandal, Manjhi, Mahato, Mushar, Sahani, Sharma, Pandit, Paswan, Prasad, Rawani, Thakur, Mukhiya, Pasavan, Pasawan, Ravidas, Harijan, Khirahar, Rishidev, Mahaladar, Chaudhary, Tanti, Laiya, Rishi, Rajak, Saw, Ram, Ray, Roy, Das, Lal, Nag, Miya, Muni, Sada, Chaudhari, Shah, Bhoi, Devi, Turi, Naik, Manzi, Mahto, Mochi, Minya, Sahni, Singh, Suna, and Choudhary