It is the literary language for all ethnographic groups of Georgian people , especially those who speak other South Caucasian languages ( or Kartvelian languages ) : Svans , Megrelians , and the Laz . It is the literary language for all regional subgroups of the Georgian ethnos , including those who speak other Kartvelian ( South Caucasian ) languages : Svans , Mingrelians , and the Laz .