Cognomen Геркис (Gerkis 
, Gerkys , Геркис 
) , across the world, is a rare family name. The cognomen Геркис is habitual in Latvia, where it is quite a rare surname, Lithuania, where it is a rare surname, and Russia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Russia, Latvia, and Germany. Very seldom, Геркис is the forename as well as the last name.