Surname Uldai (Улдай , Uldai ) , in all the world, is an extremely rare cognomen. Much more frequently, Uldai is the forename as well as the last name.
Улдаи, Ульдай, and Ұлдай
Santos, Sanatova, and Muhtarova
, Uldai 
) , in all the world, is an extremely rare cognomen. Much more frequently, Uldai is the forename as well as the last name.