Cognomen クラース (Klaas 
, Class 
, クラース) , across the world, is a common family name. The family name クラース is habitual in Estonia, where it is quite a common surname, Seychelles, and Puerto Rico (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in South Africa, Germany, and the United States. Likewise, クラース is the forename as well as the last name.