Family name Удаи (Udai 
, Удаи 
) , across the world, is quite a rare cognomen. The last name Удаи is habitual in Japan, where it is quite a rare surname, Israel, and North Macedonia, where it is a rare surname. In absolute terms, it most frequently occurs in Japan, Israel, and India. More frequently, Удаи is the forename as well as the last name.