What does Klaas mean?
Klaas \k-laas\ as a name for boys is of Greek derivation, and the meaning of the name Klaas is "people of victory". Klaas is a variation of Klaus: variant of Claus. Klaas is also a form of Nicholas (Greek).
Klaas is an uncommonly occurring first name for males but a very prominent last name for all people (#20711 out of 150436, Top 14%). (2000 U.S. Census)
Popular alternative forms of Klaas (#unlisted) are Nicholas (#57 a year ago), Niklas and Nils. These boy names were at the peak of their popularity during the years 1900-1909 (usage of 0.3933%) and are somewhat less popular today (usage 0.3143%, down 20.1%). Displayed below is a comparison of the usage of the boy name Klaas and related names. (Top 1000 Birth Names Records, 2014)