Cognomen Jubai (Jubai 
, Жубай 
) , in all the world, is a rare surname. The last name Jubai is characteristic of Japan, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is the most numerous in Japan, Indonesia, and India. Likewise, Jubai is the forename as well as the last name.