Surname ไคลน์ (Klien 
, Khlai 
, Klayn 
) , all over the world, is quite a rare family name. The surname ไคลน์ is characteristic of Liechtenstein, where it is quite a common surname, Austria, where it is quite a rare surname, and Bulgaria. In absolute terms, it is commonest in Austria, the United States, and Brazil. Much less frequently, ไคลน์ is the forename as well as the last name.