Cognomen Клаас (Klaas 
, Klas , Клаас 
) , all around the world, is a common last name. The surname Клаас is characteristic of Suriname, where it is quite a common surname, Estonia, and South Africa. Not in comparison with a country's population, the name is most common in South Africa, Germany, and the United States. Likewise, Клаас is the forename as well as the last name.