Cognomen Kreinis (Kreinis 
, Крейнис 
) , all over the world, is a very rare surname. The last name Kreinis is habitual in Belarus, where it is a rare surname, Russia, where it is a very rare surname, and Israel. Not in comparison with a country's population, it most frequently occurs in Russia, Belarus, and Canada. Much less frequently, Kreinis is the forename as well as the last name.