Across the world, Isain (Isain 
, Исаин 
) is a rare predominantly masculine, but very seldom girly given name. The first name Isain is habitual in Mexico, where it is a rare male name, Kazakhstan, and Peru, where it is a very rare male name. Measured by absolute frequency, this name is the most popular in Mexico, India, and Kazakhstan. Likewise, Isain is the last name as well as the forename.