Family name উদয় (Uday 
, Udaya , Udai 
) , worldwide, is a common last name. The surname উদয় is habitual in Sri Lanka, where it is quite a common surname, Israel, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, it most frequently occurs in India, Sri Lanka, and Japan. Much more frequently, উদয় is the forename as well as the last name.