Family name Udai (Udai 
, उदय , Удаи 
) , throughout the world, is quite a rare cognomen. The last name Udai is habitual in Japan, where it is quite a rare surname, Israel, and North Macedonia, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Japan, India, and Israel. More frequently, Udai is the forename as well as the last name.