Surname Yugai (玉改 
, Yugai 
, Югай 
) , all around the world, is quite a common last name. The surname Yugai is habitual in Kazakhstan, where it is quite a common surname, Azerbaijan, where it is quite a rare surname, and Kyrgyzstan. In absolute terms, the name is most common in Russia, Kazakhstan, and Uzbekistan. Much less frequently, Yugai is the forename as well as the last name.