Surname Runu (Runu 
) , all around the world, is quite a rare family name. The last name Runu is characteristic of Bangladesh, where it is quite a rare surname, Malaysia, and Oman, where it is a rare surname. Not in comparison with a country's population, it is commonest in Bangladesh, Malaysia, and India. Much more frequently, Runu is the forename as well as the last name.
De, Gouda, Gogoi, Ghosh, Nayak, Nahak, Mandal, Mondal, Sardar, Sarkar, Behera, Biswas, Biswal, Parida, Mohanty, Pradhan, Debnath, Maharana, Banerjee, Karmakar, Mukherjee, Chatterjee, Gauda, Dutta, Panda, Patra, Pal, Ray, Roy, Dey, Das, Saha, Sahu, Paul, Devi, Gaud, Chakraborty, Jena, Naik, Malik, Majhi, Sahoo, Singh, Sethi, Sethy, Swain, Barik, Kundu, Nath, and Bhattacharya