Cognomen Lejn (レーン 
, Lejn 
, ליין 
) , in the entire world, is a rare last name. The surname Lejn is habitual in Israel, where it is a rare surname, Kazakhstan, and Russia. Measured by absolute frequency, it most frequently occurs in Russia, Kazakhstan, and Japan. Very seldom, Lejn is the forename as well as the last name.