Surname Petruss (Petruss 
) , throughout the world, is a very rare family name. The last name Petruss is habitual in Latvia, where it is quite a rare surname, Italy, where it is a very rare surname, and Germany, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Latvia, Italy, and the United States. Very seldom, Petruss is the forename as well as the last name.