Cognomen Ройсс (Reuss 
, Ройсс 
) , all around the world, is quite a common surname. The last name Ройсс is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Austria, and Switzerland. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Austria. Much less frequently, Ройсс is the forename as well as the last name.