Cognomen Udaay (Udaay 
) , in the entire world, is an extremely rare family name. Predominantly, Udaay is the forename as well as the last name.
Man, Sihan, Chand, Bhanu, Kumar, Ravat, Gupta, Vamar, Yadav, Sharma, Shamar, Partap, Parsad, Pasvan, Prasad, Pratap, Thakur, Shankar, Chandra, Chauhan, Bahadur, Parkash, Sinnh, Singh, Masar, Isah, Sah, Sih, Sud, Bai, Bir, Pal, Ram, Raj, Rai, Das, Prakash, Lal, Vir, Sahu, Sing, Bhan, Kant, Kaur, Rana, Nath, Negi, Vati, Jha, and Narayan