Cognomen Kreilis (Kreilis 
) , all over the world, is a rare last name. The cognomen Kreilis is characteristic of Latvia, where it is quite a rare surname, Estonia, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Latvia, the United States, and Estonia. Very seldom, Kreilis is the forename as well as the last name.