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Globally, Klaas (Klaas
, Клас
, Клаас
) is a common boy's first name. The first name Klaas is habitual in Netherlands, where it is quite a common masculine name, South Africa, and Belgium, where it is quite a rare male name. Measured by absolute frequency, this name is the most popular in South Africa, Netherlands, and Germany. Also, Klaas is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Klaas | Netherlands, Belgium, United States, Germany, South Africa |
| Клас | Kazakhstan, Kyrgyzstan, Russia, Ukraine |
| Клаас | Kazakhstan, Russia, Ukraine |
Claas, Claus, Glas, Klaes, Klaus, Klausová, Klaâ, Klås, Nicholas, Niclaas, Niclaes, Nicolaas, Niklaas, Nikolass, Κλάους, Νίκολας, Νικόλαος, Νικόλας, Клаус, Мікалай, Никола, Николаев, Николас, Ніколас, ניקולס, קלאוס, كلاس, كلاوز, كلاوس, كلوز, كلوس, نيكولاس, کلاس, คลาศ, ნიკოლასი, クラウス, ニコラス, 克拉斯, 尼古拉斯, and 尼古拉耶夫
Klaas is also a name for the fictitious and mythical characters: Klaas Guts ; Klaas Vermeulen ; Klaas , the operatic character in the opera Die Entführung aus dem Serail by Wolfgang Amadeus Mozart; Klas Svensson , the fictional character of the Bert Diaries and Claes Waltin .