Last name Кайрыс (Kairys 
, Кайрыс 
) , in the world, is quite a rare cognomen. The last name Кайрыс is habitual in Northern Europe, particularly Lithuania, where it is quite a common surname, Ireland, where it is a rare surname, and Norway. In absolute terms, this name is the most popular in Lithuania, the United States, and Australia. Much less frequently, Кайрыс is the forename as well as the last name.