Last name Rithwik (Rithwik 
) , globally, is a very rare family name. The family name Rithwik is characteristic of Southern Asia, particularly India, where it is an extremely rare surname. More prevalently, Rithwik is the forename as well as the last name.
Ram, Ananth, Katuri, Ramesh, Rapaka, Rinish, Ghanta, Terala, Neelam, Nuguri, Shivram, Subhash, Prathap, Aggarwal, Karumuri, Kodamana, Poleneni, Erukulla, Kuzhippat, Pulicherla, Mantri, Naidu, Nayak, Jacob, Raj, Rao, Babu, Puli, Goud, Luke, Nair, Hari, Manne, Suryavanshi, Mohan, Shaji, Singh, Anand, Kumar, Patra, Patel, Raman, Reddy, Gampa, Menon, and Nichenametla