Family name Ratnu (Ratnu 
) , worldwide, is a rare surname. The family name Ratnu is characteristic of India, where it is a very rare surname, Australia, and the United States, where it is an extremely rare surname. More prevalently, Ratnu is the forename as well as the last name.
Ram, Tambe, Valvi, Oraon, Yadav, Urade, Mohite, Shitap, Suvare, Cavhan, Kamble, Patade, Rathod, Revale, Lamani, Lohara, Jadhav, Nivate, Chauhan, Ghadshi, Ghavali, Dingankar, Gotad, Gurav, Gawde, Pawar, Das, Lal, Mali, More, Mura, Bane, Pagi, Devi, Naik, Oram, Ghanekar, Orao, Malap, Munda, Singh, Surve, Baiga, Kadam, Korra, Kumar, Patil, Pavar, Urao, and Chodipalli