Surname Гайдіс (Gaidys 
, Гайдіс 
) , in the world, is a rare cognomen. The cognomen Гайдіс is habitual in Lithuania, where it is quite a common surname, Latvia, where it is a rare surname, and Germany, where it is a very rare surname. In absolute terms, it most frequently occurs in Lithuania, Germany, and Brazil. Very seldom, Гайдіс is the forename as well as the last name.